[subiesailor]

Your primary issue will be cooling and braking. The less the trailer weighs the more cargo weight you can haul. Open trailers have weight advantages over enclosed. Typically cheaper to find also. Tire size the larger you go the more dependable the bearings and tires on long trips.

Ill dig around for the thread similar to yours. We covered trailer ideas and packing tips for some one doing a similar trip. He targeted about 1500lbs given he was crossing hot AZ and climbing the front range. I recall

 

[subiesailor]

Great reading for ya some one who did the same type of trip and his feed back post trip. Your towing experience will be the same with more power. Cooling and brakes along with turbo health being your primary concerns.
http://www.subaruoutback.org/forums...ve-towing-5x9-utility-trailer-w-2-5i-cvt.html

 

[subiesailor]

This was the planning thread for the feed back thread above.http://www.subaruoutback.org/forums/61-general-discussions/40604-towing-uhaul-4x8-obxt.html