There's pretty much no parts , just a cast. A majority of the Cybertruck will cost next to nothing to produce besides materials cost. The rest is overhead and the bills already accounted for
I sell Airstream occasionally...
The GVWR seems to be no issue for that size if you go with the dual or tri motor CT. The tongue weight is often what stops a truck from being able to tow a trailer, but with the adaptive air suspension I would suspect that CT is above average in that department...