I just finished the mount for my rear under bed battery.
The mount is supper strong, can't budge it, so It'll support the battery no problem. I had to weld extra supports to stiffen side and forward.
I move the battery to rear on most of my off-road trucks. Better weight distribution, Cleaner engine bay.
I'll be running 0/1 Welding cable to the front. Welding cable has a high copper content, un like auto grade cable. There will be a rear emergency cut off switch too, I'll put a distribution block up front for the power. Main input from battery, large gauge out to wench, 8AWG to starter, 8AWG to factory fuse-block, and 8AWG to custom fused relay center. And a fused 8AWG cable from the rear battery, popped up to the rear behind the seat for audio.
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