They are going to be where you find them. There are quite a few trees that will grow in bunches surrounded by meadows along with small draws they the bucks will like to either feed in or bed down in. We used to find them bedded down right in the middle of a meadow as high as they could almost get as long as they were still in the grass. You'll just have to figure it out once you get there.
On the parking, it is illegal to park along side the freeway in the right of way. However a lot of hunters and hikers do it, but all it would take is one patrol man that is having a bad day to have your vehicle towed. There also are not that many places to actually park to access the area. You have the Vail Pass rest area and then in East Vail you can park at the trail head at the end of Bighorn Road.