I can push my 10.5' raft into the truck bed with the frame on it no problem. I am surprised you are having an issue.
during salmon fishing season, I keep it blown up all fall and winter and roll it in and out of garage on a couple harbor freight furniture dollies, pick up the bow and set it on the tailgate, then pick up the back and shove it in.
30 In x 18 In 1000 lb. Capacity Polypropylene Dolly