I bought a Attak 'trail sled' this year and do use it in the Bear Lake area in Utah/Idaho. We currently have 6 feet of dense base with up to 2 feet powder on the top for the last 2 weeks. It would be better to have my RX1 Mountain, but the Attak runs good at stock specs. So it isn't a necessity that you change anything. I however did gear down and lightened my weights last night to compensate for our 4500 to 8500 altitude. Havn't been stuck yet, but I'm not trying to highmark. - Hooker