Looks good. Interior plate should be the key to strength. Plan is to make ours significantly bigger than yours, mostly because of the damaged wood where our original plates pulled through. I'd say you should find some rough roads and see how sturdy the setup is. I can't imagine your pulling those bigger plates through, especially if you're vigilant about airing down tires and adjusting shocks/ air bags. Anyhow if worse comes to worst you can drive some pretty rough roads with no rear turnbuckles (as long as you keep your fronts tight) and freeway miles are casual at high speed with only front mounting points.
Send an update!
I'm still waiting for the fabricator to get back home from a family emergency back east. I should have photos and a test drive report by the end of next week.
Edit: I just looked at the photo of the outside plate (shown with quick link) more closely, and agree they could use some tweaking. I can't tell exactly how or where they're fastened to the camper - did you use washers or some other sort of spacer? I think you're smart to go with the old aluminum plates for now. In addition to fitting more cleanly they probably do protect against damage by bending under extreme force (eg, hitting an erosion channel on a dirt road at 20 MPH). Bill at Hallmark actually told me he'd designed them with that in mind. When we got our camper (used) the old outer mounts were already bent, as per a prior post describing mounting the camper on the truck. Maybe if we'd bent them back to their original shape they would have absorbed some of the force of the bump that tore the upper plates through.
I'm wondering why our original outer plates had been mounted with screws through the carbon fiber camper shell in addition to the carriage bolts fastening them through the camper floor..? Didn't seem to offer much (if any) extra strength, and bringing the plate out wide from where it's effectively fastened seems like it would create a lever arm that would make the plate easier to bend. Perhaps a good thing when it comes to one big bump that'll bend the plate instead of tearing up the camper, but after that big bump and bend what's the use? I suppose the extra width may be necessary for turnbuckle clearance at the back end of the truck, unfortunately I can't go out and check that now because the truck & camper are at the shop.
Our metal fabricator suggested putting engine mounting springs onto the outer plates' turnbuckle mounting points to be able to absorb sudden strong forces repeatedly. We've got a pretty good idea what the final product will look like, but we're going to sit down and take a look at the materials and make final design tweaks before he starts fabricating toward the end of the coming week.
Edited by DoGMAtix, 09 January 2017 - 05:29 PM.