jefe4x4,
Right now we are leaving the flatbed connected to the Isuzu frame as it was done 7 years ago by the fitter. Their attachment method was u-bolts around the Isuzu frame rails to the flatbed rails.
We are planning to attach the camper to the flatbed with torklift spring mounts.
I am pretty sure everything is going to flex somewhat. I don't have any plans right now to change the way the steel flatbed is mounted to the steel Isuzu frame (the big u-bolts).
Edit: Oh, I realized that some of the discussion our camper tiedown (this may not be the part that you are concerned about) was in another thread. I did this because I thought it might spark a 45 page war on the best type of tiedown and didn't want to clog the main build thread ;)
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/27174908/srt/pa/pging/1/page/1.cfmWhat I ended up going with is similar to the mockup, except the rear torklifts pull forward. I have a mount already welded up and the flatbed frame drilled for it. I guess I should put a picture of that in the build thread here.
