You never want to compress the forks more than about an inch max. All you need to do is keep the front wheel straight with a wheel chock, then tie the bike to the floor with tie-downs. It should bounce a little but not so much the tie-downs come loose. If you do a search for 'trailering' or 'tie downs' you might find a few of us have discussed this over the years.
The side-bars inside most enclosed trailers are NOT designed to handle the weight so before attaching tie-downs to walls be sure they will handle the impact.
Most of us use soft-ties at the center of the handlebars near the risers, then attach tie-downs to the floor just forward of the front axle and about a foot or more to the side of the tire. Some of us use tie-downs to keep the back wheel from going left or right when trailering side-by-side bikes, which is rare but its good to ease the mind on long trips. I've gone 1200 miles each way several times, no troubles.
Hope this helps.
See also: http://rswarrior.com/forums/t/14540.aspx
beach:
This coming weekend, I am going to Minnesota from Illinois to visit a friend, who also bought a warrior. I am taking it up in an enclosed trailer. My question is about the front fork's or suspension. Usually when I trailer it, I like to compress the fork's pretty good to make sure the bike doesn't move. I have never trailerd it that far and was wondering if it's bad for the fork seal's or anything else to be compressed for 10+ hour's? Thank's