I read on another forum that the 2nd gen insights have about a 900lb load limit, not including the drivers. I'd logic that I should be able to do a few hundred lbs for an extension, then
It might make sense to brace against the strut towers, or elsewhere, though, to help stiffen the chassis, and install stiffer springs to maintain ride height.
All this talk about tents is silly. Tents are so purpose-built, they all suck for some stuff and are awesome for other stuff. The bus tent is probably awesome for camping at hippy festivals, but would suck for hiking. Yadda yadda.