Basic size used in most of the manufactured ones is 1 in. OD, .090/.095 wall thickness, welded seam. If you want to step up from that, DOM tube (drawn over mandrel) is marginally stronger, more "accurate" tubing. PA Steel sells 1" welded for .90 a foot. DOM is a little over a dollar a foot. The design of the chassis will dictate strength more than the tubing will. The bigger you go the heavier it gets, and the more the design needs to incorporate that factor. If you intend to home-build, consider shopping around for buggy plans to work from and get feedback on them before buying.
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