OK, Here are some before and after pictures of how I'm hauling (2) 12.5 foot Wilderness Systems sit on top fishing kayaks inside my Adventure Trailer.
The first weekend we went out I wasn't fully prepared so we could only take one. I simply laid it on the floor and tied it down to some anchor points I had screwed to the floor it worked fine. The kayak didn't move an inch in a 140 mile trip.
The next trip, I was still didn't really have anything made up to haul both Yaks. I remembered we had some 2" PVC pipe "contraptions" at work. They were originally built to hold up a banner at a Home and Garden show we were exhibiting at. The entire plan was abandoned at the last moment, so the half done frameworks were laying out behind the dumpster at the office. I couldn't see them going to the landfill, so I thought I'd try to build a 2-place kayak rack out of them.
I brought them home and started to measure and cut. I had to make a run to the store for a couple more 2" "T's". and some couplers. I made a simple "H" shaped rack that would hold the two yaks stacked on top of each other and strapped to the floor.
It worked just as planned, but then I started to think of where the heck am I going to store this monstrosity when I'm not hauling the yaks.
I already have a nice covered rack on the side of the garage where I store them when we are not using them.
Hauling the kayaks in the trailer was one of my original intentions from the first day I started to design the trailer. I wanted to have a simple web sling that would hook to the walls and hold one up above the other. They only weight 65 pounds each so I knew it was possible. With the strap slings, I could simply unhook them and easily find a place to store the straps inside the camper when not being used.
Well today I dove in and started to drill holes in my trailer again. I used all stainless steel hardware for everything that will be outside. I had some 2' wide nylon strapping laying around, so I fired up the sewing machine and made 2 custom measured straps with snap hooks on each end and some rings sewn on to hold a rubber bungee strap.
Check out the pictures, it will all make more sense when you see it.
My brackets are bolted straight through the 1" wall studs with 1/4 inch stainless bolts.
It may not be the prettiest looking on the outside, but I know it's the strongest way to do it.