Thank you all again, I do appreciate the input. I am reconsidering some of the underframe welding for the flexibility reasons you all point out. Yes, if I go with bolting I'll use lock washers and loctite for sure! Hadn't thought of tacking the nut on but that's interesting.
I thought I would weld the angles that will be attached to the bus frame and then bolt the rest. After pondering for too long I suddenly realized that if I insist on welding it all then how am I to remove the potable and gray water tanks if I need to replace them or work on them? Same goes for the split system AC unit I'm going to do and also the storage bins.
On another note, I'm still having cranking issues. Last Friday I took my existing cranking batts to Interstate and traded them in for new ones. But, now I'm getting the exact same thing. Check this out:
The cranking volts still seem low at ~10v-11v. Just like the old batteries. In fact it's lower than the old batteries. When they were holding a charge it would be just under 12v. So, it would seem I have another issue at hand? Any suggestions where to start?
As always, thanks in advance!