You may have to revisit the bed tool box with a 5'er if it sits on the rails; might be too tall to clear the 5'er nose in a corner.
My recommendation is to seek a 5'er with an onboard generator, or at least onboard prep so that you can use your existing genset. Then you don't have to bother with keeping it in the truck. As for firewood, I lay it flat, single row heigh throughout the bed around the slider hitch. I use a Superglide which you can move by hand when not hooked up to verify clearance.
The joys of owning a short-bed pickup
