Extending a frame is not the hardest thing to do, but if you question your capability then I would suggest you farm the work out. Far as aluminum for framework of the box, there are lots of them made that way!
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For now 1996 Dodge Ram 5.9 Cummins 365HP 830TQ pulling a 2006 28' Dutchmen Fifthwheel and at times a 16' boat behind that!
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