Moving that rear axle back does a lot for the long ass thing on FJ60s! Your truck looks pretty pimp!!
Question: do you plan to box the body back in where you built the tower and cut it up in the rear?
I did the same thing on my Patrol, ie moved the rear axle way back and cut up the body. I left it that way and ran it open for a one week long trip in Arizona. I also played around a few times in it on much shorter trips. I put a tarp over the huge hole and it still sucked balls. Reason being; dust, mud & water came into the truck even with it tarped off. More then anything I really hated cleaning it all up after wheeling. It made it a huge pita to get the inside of the truck clean not to mention at times the dust coming into the cab was down right nasty.
Here is what we did to box it up in the rear...
It made a HUGE difference in ejoyability of the truck off-road. Even if I was just rock crawling I still got a ton of dust inside the truck with it all open. I don't use my Patrol for just rock crawling so something had to be done! I personally think if you are going to have a full bodied rig that the advantages of the full body should be used. For me that is no dust/dirt/water/mud in my cab. Plus being able to use the heater and be protected from rain/snow/hail. If that stuff isn't important I ask myself why not just hack most of the body off so there is less sheetmetal to worry about smashing!?
Any ways, sorry for blah'ing on in your build thread....cool truck you have!
*Edit* I see you have truck fenders for it, I didn't look throught he whole thread when I posted this. I am interested to see how that all turns out once you get it done.