I'm trying to envision it having a heavy duty enough rack to hold the weight of a fiberglass boat plus trailer, How well it must be reinforced, and how heavy the rack itself must weight? and why doesn't it extend over the top of the cab? at what anchor points would the rack be mounted?
I've had ladder racks on some of my trucks, and even though at times I've loaded it down with building materials I was concerned if ever I had to suddenly stop, what might would happen, because ladder racks only mounts to the top of the bed with only a few bolts to anchor it down each side,
I suppose the truck being towed by a tall RV, The RV helps to cut the wind from the boat, Otherwise I would think that of itself would be a problem to deal with,