The Stronghold XL- Hard Sided Electric Roof Top Cabin

The Stronghold XL-by Sparks Overland
Carbon Fiber All-Season Rooftop Cabin with Electric Lift & Climate Control Compatibility.  Made to order. Please allow 3 months for production. 
 
The Stronghold XL is the big brother to our original Stronghold—built for those who want more room, more capability, and more presence on the vehicle. It’s not a tent. It’s a full rooftop cabin, engineered for serious overlanders, long-range explorers, and families who refuse to compromise when conditions turn hostile.
 
Designed for adventure vans and mid-size to full-size trucks, the Stronghold XL delivers true four-season protection, refined comfort, and uncompromising strength in a larger, more commanding footprint—without sacrificing performance or durability.
 
This is the Stronghold concept, scaled up and pushed further.
 
Carbon Fiber All-Season Rooftop Cabin with Electric Lift & Climate Control Compatibility
 
This is shelter you trust when conditions don’t care.
 
Carbon Fiber, Done Right
The Stronghold’s carbon-fiber outer shell dramatically reduces weight while increasing stiffness and impact resistance. That means better handling, higher payload efficiency, and a structure that thrives under vibration, wind, and miles of abuse.
 
We didn’t choose carbon fiber to look impressive.
We chose it because it’s stronger, lighter, and smarter for real travel.
 
Purpose-Built Features
Electric Lift System
Deploy your cabin at the push of a button. The remote-controlled electric lift raises the shell smoothly and quietly in seconds—no cranking, no climbing, no struggle. Included is an emergency, manual back up system. 
 
Bottom Entry Design
A strategic bottom hatch keeps all four walls sealed and fully insulated. The result: superior warmth retention, precise airflow control, and exceptional weather protection—while keeping dirt, snow, and debris outside where they belong.
 
Spacious, Livable Interior
With 118” x 65” of sleeping space and 39” of interior height, the Stronghold XL comfortably sleeps two adults and a two children, with enough headroom to sit up, change, and move freely.  Interior space to fit a queen size mattress. 
All soft touch interior with "R" value of 9
Built in LED lighting
Max Air ventilation fan
Optional built-in mattress
Slide open windows with built-in screens
 
True Four-Season Insulation
A rigid FRP (fiber-reinforced plastic) shell paired with a PET insulated core delivers thermal efficiency, sound dampening, and structural integrity. From winter storms to desert heat, the Stronghold is built to perform year-round.
 
Off-Grid Power Ready
Optional integrated lithium power supports lights, fans, heaters, AC, and accessories—without draining your vehicle battery. Optional 400W solar capability keeps you self-sufficient far from civilization.
 
Hard-Shell Confidence
Engineered to withstand max 40MPH winds, heavy snow loads, and relentless road miles. This is a cabin built for expeditions, not just weekend escapes.
 
Secure & Refined
Push-button electronic locking offers quick, reliable security—no keys, no hassle. Simple, modern, and built to last.
 
Because shelter should be your strongest piece of gear.
 
Specifications:
Width 118"
Length 65"
Weight 352lbs
 
Height (when closed) 9"
Height (when open) 44"
Interior Open Height: 3 Feet
 
Made in Hong Kong