Thanks guys! Yeah I'll admit its probably a touch over built. Its not to bad though. The top frame is 1.5"x1" 16 gauge on 3 sides and 1x1 on the front. I wanted the top frame to be pretty stiff since I was cutting out one of the floor joists. The rest of the frame is 1.5" 1/8" Angle iron. The sheet metal is just 16 gauge. Results is a pretty strong box but its lighter then if I would have just made the entire box out of thicker steel plate. Also when cutting holes in it for vents, wires, ect is much easier since I'm just drilling through sheet metal. Can't wait for the next camping trip. The box will work great for camping chairs, drop cords and what ever else fits in there. I plan on sticking a small box on the tongue of the trailer where the battery box use to be for small odd and ends. Even with that the tongue should be much lighter with out that 60lb battery hanging out there on the end.
I do have a question for the electric gurus out there.. I'll probably post over in the electric forum to since might get a little more traffic. Now that I have the two batteries I moved the charge wire from the converter back to the cargo box. Now my plan was to connect the 8 gauge wire from the converter to one of the batteries and then run a short piece of 4awg from that battery to the other battery to connect them. Then the plan was to run connect the solar charger to the other battery. Then connect the inverter to which ever battery. Both the inverter and the solar charger is going to be mounted between the batteries right there in the box so your talking 15-24" of wire to run to one battery..
Now after reading up on chargers, multiple battery setups ect. It seems its recommended to have the exact same length of wire between the charger and the batteries. So for me to do this with my setup I would need to have some kind of terminal where everything connects to. As in have say 30" 4awg wire running from each battery to this terminal then also have the wires from both the power converter and the solar charger connect to the same spot. And I guess probably connect the inverter to this spot also. Now this doesn't seem ideal to me because I would have a little more wire between the batteries and chargers. It also would add more connections to the setup. I can't see one battery having an extra 30" of wire between it and the charger causing that much of an issue. Even more so if I go with a large wire like 4 gauge. But who knows it might. I'm just a little unsure whats the best way to go about it.
Here is a picture to show what I mean.. Don't laugh it was a quick mac paint scribble