I haul my bike from AZ to MI and then back to AZ every year in a 6x10 enclosed trailer and I just use long ratchet straps and loop the strap over the lower triple tree, That way you don't need soft ties because both hooks are attached to the tie downs on the trailer floor. I also cinch my bike down real good because I found it to be better that the bike doesn't bounce around in the trailer so I compress the forks about 3/4 of the way, in the back I put the straps to the saddle bag guards and I cinch them down good as well. When just hauling the bike to the shop or on short trips like a few hundred miles and I don't have anything else in the trailer I don't even mess with tying down the back of the bike, I only tie down the back of the bike on my cross country trips because I have other items in the trailer and I want to make sure nothing moves. I never had any damage to the bike or the suspension by hauling the bike either way and this is my 4th year of hauling the bike across country.
08 FLTR candy red sunglo, 103 Stage II, Woods TW-222 cams, V&H Dresser Duals with Monster Rounds, Thundermax tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.