We've rented from both S&K Rentals and Dean. S&K had air conditioned SUV's that would seat 6 people. Dean (or his wife) will come pick you up from the dock (he's picked us up from Wonky Dog). Haven't had one of his open air trucks - we always get the "ghetto" van with missing dashboard and linoleum for the floorboards. And we love it!! It's part of the charm of Anegada! :-)
BTW, each ran more like $75/80 per day.