I say figure out the total cost of travel, hotel rooms out, time off from work driving... everything. Then figure out what the total experience is worth - I would much rather fly out, rent sleds, stay in a nice place and then fly home. I also figure the what "if's" traveling that far - wreck the trailer on the way out and now nobody can go, get stuck in weather or have truck issues and now the trip is delayed a day and you loose a day of riding. Not knowing what type of sleds you ride, but I would rather ride sleds that are tuned and setup for the area, if you have an issues then take it back and get another sled to ride.
I also understand the experience of taking the road trip with buddies and fixing sleds until way into the night and morning so you can ride the next day - those are what makes trips great and stories for years to come.
Get with Cody at CM Backcountry Rentals -http://www.cmbackcountryrentals.com
He can hook you up with some great running sleds, get you in touch with some killer cabin rentals and if you ask nice - even show you around the McCall Idaho area.