the transom of my hard bottom inflatable but the transom has a built in support that won't allow me to through bolt. The wheels ride in the up position but swing down for a beach landing. they can take a pretty good hit once in a while. I don't have much faith in lag bolts because they seem to back out. I'm wondering if drilling and tapping the fiberglass for several 1/4 x 20 cap screws would be strong enough. I would bed them all with 5200 and I could use one through bolt at the very top. Any other ideas???