The sole positive is he can plug a welder into it...
But it's a hell of a lot cheaper to just put a generator in the bed of a real truck. Plus you won't accidentally use all your battery welding and be stuck. Since you can't just bring out a new battery, you'd have to tow it back.
I don't play the game so I've got no stocks in this, but why on earth did Epic even agree to it? Tesla must've put a ridiculous amount of zeroes on that paycheck. I mean you might as well put Hitler's car in it at this point.