The core difference between Mammoth Overland and Turtleback Trailers is where you sleep. Turtleback builds gear, kitchen, water, and power platforms — the Expedition Shell at $22,895 and the Getaway Shell at $18,030 — with no interior sleeping space. You sleep in a rooftop tent mounted on top, purchased separately for roughly $1,500 to $4,000. Mammoth Overland builds enclosed insulated cabins with a mattress inside, from the HV at $32,500 to the XLE at $123,994, with the kitchen swinging out from the rear hatch. Both brands are American-built, both use Timbren axle-less independent suspension, and both put aluminum skins over steel.
Everything else in this comparison follows from that one difference. A Turtleback plus a tent lands in the mid-$20,000s and puts you in fabric on a ladder. A Mammoth HV at $32,500 puts you inside on a 77-inch mattress behind a locking door, and the WLY and ELE add a furnace and air conditioning as standard equipment — climate control that isn’t possible in a tent at any price.
The Short Answer
Turtleback Expedition and Getaway shells start at $22,895 and $18,030 respectively, and a rooftop tent is not included — budget another $1,500 to $4,000 depending on what you choose. A realistic Turtleback build with a tent lands in the mid-$20,000s.
The Mammoth HV starts at $32,500 with an enclosed aluminum cabin and a 77-inch mattress inside. The WLY at $59,500 and the ELE at $69,500 both add a furnace and air conditioning as standard equipment — climate control that is simply not possible in a fabric tent at any price.
If you already own and love a rooftop tent, or you want maximum gear organization for the least money, Turtleback builds a genuinely good product and you should look at it seriously. If you want to sleep inside, in a real bed, with heat and air conditioning, Mammoth is the only one of the two that does that.
What Turtleback Actually Is
Turtleback builds two models out of Phoenix, Arizona, in trailer and shell configurations:
| Model | Base MSRP | Water | Tow requirement |
|---|---|---|---|
| Expedition Shell | $22,895 | 42 gallons | 3,500 lbs |
| Getaway Shell | $18,030 | 21 gallons | 2,500 lbs |
Both ride on a welded 2″ × 3″ galvanized steel tube chassis with an aluminum floor system, Timbren axle-less 3,500 lb suspension with independent control arms, a Cruisemaster DO35 articulating hitch, and 265/75R16 all-terrain tires on 16-inch steel wheels.
The equipment list is genuinely strong for the money. REDARC TVMS Rogue power management, a lithium battery, a composite slide-out kitchen with a Cook Partner stove and Dometic sink, on-demand hot water, a shower assembly, modular drawer systems, MOLLE panels, and a roof rack. The Expedition’s 42-gallon water tank is double what Mammoth’s teardrop models carry.
What it does not have is anywhere to sleep.
What You Get Inside a Mammoth
Every Mammoth trailer is an enclosed, insulated aluminum cabin with a mattress in it.
HV — $32,500. A 77-inch-long mattress, 76 inches wide at its widest point. Galley kitchen with a two-burner stove, sink, and electric cooler/fridge. A 21-gallon water tank with on-demand hot water. 100Ah AGM battery with a 1kW true sine wave inverter. Cabin heat is an option at $1,900 for the Dickinson Marine propane unit or $2,350 for the Truma VarioHeat. Cooling is an option at $2,500 for the Fresair S6 or $3,500 for the Dometic air conditioner.
WLY — $59,500. Same cabin, but with an R25 insulated floor and wool-lined R12 walls, a Truma VarioHeat furnace and Dometic RTX 2000 air conditioner both standard, winterproofed heated water lines, and an 800Ah self-heating lithium battery bank.
ELE — $69,500. Dickenson heater and Dometic air conditioning standard, a 32-inch TV standard, a 400Ah self-heating lithium battery, plus the sealed pressurized cabin, air purification, and security package.
TL — $69,500. A king mattress plus two full-length 6’2″ bunks, 6’3″ of interior headroom, an indoor shower and sink, a 50-gallon water tank, and a Truma VarioHeat standard. Air conditioning is a $3,500 option.
The kitchen is still there on all of them — it swings out from the rear hatch, same basic idea as Turtleback’s slide-out. You don’t give up the kitchen to get the bedroom.
The Rooftop Tent Question
A good rooftop tent is a good rooftop tent. Plenty of people camp happily in them for years, and the argument for one is real: it packs down small, it goes on a rack you might already own, and it keeps you off the ground.
But it’s worth being honest about the daily experience compared to a hard-sided cabin.
Setup and teardown, every time. A tent deploys and stows at every stop. A trailer cabin is open when you open the door.
The ladder. In the dark, in the rain, in the snow, at 3 a.m., every time.
Temperature. Fabric has effectively no insulation value. You are at ambient temperature plus whatever your sleeping bag provides. A Mammoth WLY has an R25 floor, wool-lined R12 walls, and a furnace.
Heat and air conditioning are impossible. This is the part that doesn’t have a workaround. You cannot air condition a rooftop tent. On a WLY or ELE, both come standard.
Condensation. Fabric tents breathe, which is good for moisture but bad for warmth. Enclosed cabins with proper ventilation manage it differently.
Noise and weather. Wind against fabric is loud. Rain against fabric is louder. Both are considerably quieter through aluminum.
Security. Hard walls and locking doors versus zippers.
Hard-Sided Access
One practical consideration that catches people out: many campgrounds in bear country restrict certain sites to hard-sided units only, particularly during active seasons. Rooftop tents are soft-sided.
This isn’t a comfort preference, it’s an access restriction. If your camping takes you into serious bear country, it’s worth confirming the rules for the specific areas you visit before assuming a rooftop tent will get you a site.
Where Turtleback Genuinely Wins
Price. $18,030 for a Getaway shell is a lot of trailer for the money. Even with a tent, a Turtleback build comes in below a base HV.
Water capacity. The Expedition’s 42-gallon tank is double the 21 gallons in Mammoth’s HV, WLY, and ELE. Only the TL’s 50-gallon tank beats it.
Tow requirement. The Getaway needs a vehicle rated for 2,500 lbs and the Expedition 3,500 lbs. That’s accessible to a lot of vehicles.
Storage organization. Modular drawer systems, dual side-door access, nose box and side boxes, MOLLE panels throughout. Turtleback’s entire design premise is keeping gear organized and accessible, and they execute it well.
Galvanized chassis. Hot-dipped galvanized steel is more corrosion-resistant than painted or powder-coated steel, which matters in coastal and heavily salted environments.
Dealer network. Turtleback sells through dealers, which means local service. Mammoth sells factory-direct from Woodinville.
Keeps the tow vehicle free. With the tent on the trailer, you can drop the trailer at camp and take the vehicle out for the day. Same is true of a Mammoth, but worth noting it’s not a Mammoth-only advantage.
Where Mammoth Wins
There’s a bed inside. The single biggest difference, and the reason most cross-shoppers end up choosing one or the other rather than agonizing.
Climate control. Heat and air conditioning are standard on the WLY and ELE, and available on the HV and TL. Not possible in a tent.
Four-season capability. R25 floor insulation, wool-lined R12 walls, a Truma VarioHeat, winterproofed heated water lines, and self-heating lithium batteries that can accept a charge below freezing. A rooftop tent in February is a fundamentally different experience.
Standing headroom and an indoor shower. The TL and XLE offer 6’3″ of interior height, a king bed, two bunks, and an indoor shower with a 15″ × 25″ floor.
Sealed cabin and security. The ELE and XLE offer a pressurized cabin with air purification, bulletproof windows, and weapons storage. There is no Turtleback equivalent at any price.
Range. Mammoth spans $32,500 to $123,994 on shared construction. Turtleback tops out roughly where Mammoth starts.
Which Should You Choose?
Choose Turtleback if:
- You already own a rooftop tent you like, or you genuinely prefer sleeping in one
- Your budget is under roughly $30,000 all-in
- Gear organization is your top priority
- You want a local dealer for service
- You’re towing with something rated below 3,500 lbs
Choose Mammoth Overland if:
- You want to sleep inside, in a real bed, behind a locking door
- Heat or air conditioning matter to how and when you camp
- You camp in winter, or want to
- You need standing headroom, an indoor shower, or space for four
- You camp in areas with hard-sided restrictions
- You want a platform that can grow with you across a wide price range
Frequently Asked Questions
Does a Turtleback trailer have a bed inside? No. Turtleback trailers are gear, kitchen, water, and power platforms with no interior sleeping space. Sleeping is handled by a rooftop tent mounted on top, which is purchased separately.
How much does a Turtleback cost compared to a Mammoth? Turtleback Expedition shells start at $22,895 and Getaway shells at $18,030, before adding a rooftop tent. The Mammoth HV starts at $32,500 with an enclosed cabin and mattress included.
Can you put heat or air conditioning in a rooftop tent? No. Climate control requires an enclosed, insulated space. Mammoth’s WLY and ELE include both a furnace and air conditioning as standard equipment; the HV and TL offer them as options.
Do Mammoth and Turtleback use the same suspension? Both use Timbren axle-less independent suspension — Turtleback with 3,500 lb units paired with their own control arm setup, Mammoth with Timbren 3500HD on the teardrop models and dual 5200HD on the TL and XLE. Neither has a through-axle beam hanging beneath the trailer.
Which holds more water? The Turtleback Expedition’s 42-gallon tank beats Mammoth’s HV, WLY, and ELE, which each carry 21 gallons. Mammoth’s TL carries 50 gallons, the most of either lineup.
Can I take a rooftop tent into bear country? Sometimes, but not always. Many campgrounds restrict certain sites to hard-sided units during active bear seasons. Check the specific rules for the areas you plan to visit.
Want to see what sleeping inside actually looks like? Browse the Mammoth Overland lineup or contact Mammoth Overland directly.