http://lifttrax.com/specifications/
Looks like it has promise
LiftTrax 4000R
The LifTrax 4000R (SUV version) is built to hold the weight of common 4×4 vehicles up to 8,800lb (4 tons) in weight, such as the Toyota Land Cruiser, Jeep Cherokee, Land Rover Defender 110 and Land Rover Discovery...