Road to the LOWER parking area is easier than the road going all the way up to Nellie Creek TH (Uncompahgre). We saw an Impreza WRX at this lower Matterhorn TH area. Having heard of the steepness of the road leading up to the upper TH, we left my manual tranny ‘07 Forester XT (7.9" clearance, 99.4" wheelbase) at this lower area, also.
Beyond this, we only saw large pickups, Jeeps, and a 4Runner at the upper TH. Just before reaching the upper TH, the road forks with both options leading to the upper parking, but as mentioned in previous posts, the left option is the way to go unless you‘re looking for something interesting.
Spots for 3-4 tents at the top. At the base of the fork mentioned above, there‘s space for maybe 1-2 tents more.