Didn't make any progress on this project this weekend, I had to make a surprise run to Wyoming.
Tonight I'll be fabricating the plywood mounts and bolting it down. I'm thinking of covering the ply in this stuff-
https://www.amazon.com/dp/B00F0U0IR...olid=CXEL4I4FT0NA&coliid=I3BIGV2UDZDUYH&psc=1
For the bed mounts I'm thinking that the front four mounts will be hard-mounted to the frame with stainless hardware and some rubber to isolate the steel from the aluminum. The rear four mounts will have springs below the bed that the mounting bolts will run through. It won't eliminate flex in the bed, but should reduce it a lot. From the research I've done a lot of different people build floating mounts a lot of different ways. Everything from the articulating 3-points like IdaSHO's and on the Isuzu's, to spring mounts all around, to my plan with just one end floating.
It seems like everything works, just depends on the level of flex you've got. As you guys pointed out, I don't have tons of frame flex, but I like the idea of relieving a little of the stress on the bed.
I was considering the full on spring mount, but just can't get over how the camper will pull on the bed around corners. It seems like a full four-corner floating bed would tip sideways each time I corner or when I'm on a sidehill..
Another option, if I think the rear springs don't give me enough flex, or if they bind the bed up in some weird way, is to put springs on the very front mounts too. After that, if I still need more freedom I think I'd build some sort of pivoting mounts, similar to IdaSHO's front mounts and install them in the mount location just behind the fronts. That should allow for flex along the frame, without letting the camper pull the bed around too much.
I'm just not sure that much movement would be necessary for what I'm doing..
Not sure if you guys can make any spring recommendations. There are tons of options.. They're pretty cheap though, so If I have to do a little trial and error its not a huge deal. I figure I won't need anymore than an 1" of travel or so out of each spring.