Looking to buy a hi-lo camper. What happens if the hydraulics malfunction? Can you manually crank it up like you do a traditional pop-up camper?
The hydraulics, IMHO should be the least of the worries about a hilo, it is a simple system, a motor runs off battery, which turns a pump that expands a hydraulic cylinder. YOU MUST have a good battery in it, that is the only truely important thing about a hilo, IMHO over other campers you could do without a battery if you had to.
In reality, you wont use the hand pump {if the hilo you buy has one)... think about how many pumps that would take, you would be completely exhausted, I mean completely. The pump really is a backup solution to help get the top down, or to lift a little ways so you can get to the battery box. Most of us here have figured out a way to be able to hookup jumper cables if camper comes out of storage with a dead battery...
I'm sure you are snicker-ing about me saying get the
top down... Well when top is raised, it should or will, settles down on a safety BAR for keeping the hydraulic cylinder from slowly going back down all the way, much like most lifts for autos and stuff do. Anyway, when the weight is resting on that, it is pretty hard to unlock that. so you would pump a few times to get weight off, then you could use the manual release on the pump are to let it down.
Only UNIQUE problem I can see usually have to do with maybe cables, which are adjustable and need care & maint sometimes, then there is a pair of rubber like seals that go around the top of the bottom half, and bottom of the top half... When top is up these 2 seals touch and seal the inside from outside "better" than when down.
Other than the fact the roof goes up and down for easier pulling; the rest of the camper has same issues to be wary of, as any other camper can have, like can your car tow it,
and possible leaks and damage, or appliance malfunctions, since Hilo uses the same appliances everyone else does or did.