The Xplore suspension is interesting and I agree that hydraulics are very reliable in general. The hydraulic pump and reservoir system is the same as used on dump trailers. Mine worked flawlessly and I used it often.
To understand how it works, visualize a torsion axle system. This has trailing arms that the wheels are mounted on. When the trailing arms move under load, they rotate on an axle that compresses rubber inserts that act as springs. The trailing arms sit at some point, approximately level, under normal conditions. This is the normal ride height. The system has an outer tube, an inner axle and the rubber pieces that get compressed when the inner axle rotates inside the outer tube. Normally, the outer tube is welded to the trailer frame and the swing arm position is set at some position at the factory. On the Xplores, the outer tube sits inside another tube and is rotated by hydraulic cyliners and linkages. As this tube is rotated, it changes the angle of the trailing arms to the ground and adjust the ride height. The trailer can be raised or lowered hydraulically without changing the amount of suspension travel or stiffness. But it cannot be tilted side to side.
Comparing it to the new Roamer1 system with air suspension, I like the air suspension much better. It is all about air pressure with no oil. It can be adjusted side to side. And it is much simpler with no linkages. Since it is an air system, it has a compressor and air tank, which is needed anyway for tire pressure adjustments. They both have slick remote control fobs that make adjustments super simple.
The X22 torsion system has no shock absorbers and doesn't need them, but it is a very stiff suspension. It is designed to have the tires aired down for off-road use to make the system more compliant. The R1 has good shocks that act on the swing arms. The tires can, of course, be aired down too for a softer suspension and less strain on the trailer while off-road. The R1 is more capable off-road because of its improved departure angle and added ground clearance, but it also has a much longer tongue that limits its ability to follow closely on tight turns. The longer tongue adds stability on the highway and reduces the interference with the truck in tight maneuvering.