Great looking design from your program. I am jealous.
The 3x3 is probably overkill for your floor, 2x3 would be just as strong positioned correctly and a lot lighter. The .120 wall could probably be lighter gauge as well. Certainly the wall could be much lighter gauge. It is real easy to go overboard on strength (objectively not a bad thing) but weight is critical, both for fuel mileage, and for not overloading the front axle, which is real easy to do. You be amazed at what plywood, wall board, aluminum and even fabric and carpet add up to in a unit that size. Your twin screw truck won't be nearly as bad as my single, at least your front rear can take some of the box weight. Also keep that in mind when positioning fresh/gray/black tanks as to keeping weight to the rear.
Good luck! Dave
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