"A small amount" means no inches. Not 1 inch, not 1/2 inch, no inches, zero, nada. The idea is simply to make the jack base tight against the ground. If you actually lift the trailer, you will require the frame to flex a bit, which it was not designed to do, and you can bend it, which will cause a host of other problems from leaking roof seams to cracked plumbing drain pipes."
Mine would bounce like a trampoline with "nada". Hardly any pressure at all will raise mine at least 1/2 inch. No bounce, broken frame, leaky roof or cracked plumbing. If they are that fragile I wouldn't even want to hook it up to the truck.
