I don't have any experience with fuel cells on these trucks, but from my experience in general, mount it in the most secure fashion you can do. Relocate the pick up's if needed. There are some fittings we use in the rock crawling, you run 2 pick ups, one at ether corner. There are these pickup's that can not draw air, so on hills and climbs, when one pick up comes out of fuel, it locks and you still get great fuel pressure and flow. I forgot where I ordered mine from, but they were less than $10 each. If accessing the cell is difficult, you can open the access on top with several different kits. Better to set up the cell for your mounting than to set up your truck for the cell.
I must add that a baffle system is highly recomended. Fuel cells look great, but the fuel slosh on the inside has greater force than most people reliese.
Example:
http://www.youtube.com/watch?v=pZhbdz2byYg
If you watch, you can see the cell rupture when the fuel slosh hits that corner that fails. That was the second cell that ruptured that weekend, and in the same place. That is the same cell I ordered for my Jeep. I know 3 more people that run the same cell with no issues, 2 run foam inside for baffling, and the 3rd has angle iron reinforcing all the edges.
I hope this is useful.