my legs come way down does anyone build a set of blocks to put under jacks. someone told me it is unsafe because it could roll off. I am thinking of cutting 2x4x12" and make them about 8" tall
This kind of reminds me of Abe Lincoln when asked how long a man's legs should be. He replied "Long enough to reach the ground".
I guess if your site is way out of level there could be a problem with overextending of the legs, but everyday use it isn't very likely. Some people seem to think if the legs are extended very far it can cause the trailer to be shakier. I guess that's possible.