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Originally Posted by byamcaravanner
One problem to consider regarding using tube cross members is that you will not be able to bolt the floor to the tubes using elevator bolts.
The cross members I replaced to carry my tanks are made of 14ga bent plate.
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Steve, good point. That seems to be a mark in favor of using channel: ease of access to secure the floor and frame. Aside from the flooring how would the shell u-channel be secured to the frame without using bolts? If the outriggers were constructed out of tubing the outside ends would be open and accessible but the work space for wrenching bolts would be very narrow?
Just a thought but I suppose the possibility exists to use a combination of channel and tube. The main rails would be tube and the cross-members and outriggers would be channel?