leveling on steep drops

[wingnut60]

Just returned from 3+ weeks on business and vacation. At Colter Bay in Grand Teton Park, I was assigned a space that dropped off enough in the front area that I was unable to raise my trailer enough to level it. Finally got there by placing a jack under the factory hitch to keep the truck from squatting when the pin weight was placed on the fiver hitch. Thus, I was able to use extra wood blocks to gain the height I needed. What do most of you do when faced with this--seems like the factory legs are limited to about 12" of travel. Couple of other fivers seemed to have almost twice as much travel. Am I looking at this wrong? Even with the leg extensions, I only have the built-in travel of the hydraulics, and it wasn't enough.
Since I'm new to this problem, am I missing a simple solution?
Appreciate any help.
Joe