Sandy...I never go in the summer for obvious reasons. Usually go Jan.-March and at Chisos Basin it is usually 20 degrees in the AM when I get up at 5am. I will be giving the cart a trial run this weekend with a 1 mile trek at a lake near my home and if all works out Big Bend is 10 hours away....And by the way, do you have any cherry 12x20 holders in stock?...cherry would match the Lotus.........Tav