Interesting thread on the Tesla forum towing an Airstream.

The grid will never be an issue. Growth will be slow and will be accommodated along with the adoption of electric vehicles. Most charging is done at night when there is an abundance of over capacity. Solar is growing so fast there is already mid-day glut of energy in CA requiring curtailment in renewables. Electric vehicle owners are frequently also installing home solar so net demand on the grid is often reduced when an EV is sold.