The raft is light, you can wieght the tongue with other gear to keep that problem from being an issue.
I haul my raft on a slightly too short trailer. You just need to make sure it doesn't hang too far off the back. I let the back 3+ feet go unsupported. If The boat goes under inflated it could end up limp and dragging. had a close call once, and have heard of others dragging their boats to major damage...
(seven two 0)-298-2242