Comment by DennisP

Most of the mass that goes with that acceleration is the battery, which also extends the range, and that you do need because superchargers are scarce on Mars. It's also nice to have a rugged vehicle when you don't have body shops.

In general, Musk treats engineering as a scarce resource. If he can use a Tesla vehicle instead of designing a special rover, he will, even if it weighs a little more. Starship can handle more than 100 tons of payload and its successor will do four times that.