I would love to see some close ups of what you did in the rear.
I'll see if I can find some from last year and post them up.
It's a Clayton long arm kit, double triangulated with TJ 5 1/2" lift springs. The tank was moved from stock location to the rear, which required a little cutting, but I only lost maybe 5 inches of height inside the cargo area and, if I felt like it (which, now that I think about it, I may do), I could reinstall my cargo area carpet, cover the whole thing and it'd only look like a hump in the middle rear portion of the space.
If you look at the ecxc videos from last year, there are a few of me running one of the trails and it's possible to see the flex that I have - which isn't too bad.