I would not go to SLC, I would go to Jackson (Hole) and hunt the areas around Pinedale as it is the largest migration route. (I live there). We typically see several 1000 each year with no special effort. It's a lot easier place to hunt than the "sagebrush sea" around Flaming Gorge
Don't fall for the "long range myth". If you know how to stalk whitetails, the same tricks apply to Antelope. Cover, camo and wind. With rare exceptions, the Antelope we take are shot at under 200 yards within a mile of my house. A garden variety 270, 308 or 30-06 with a good 3-9 scope and garden variety softpoints is all you need.
As far as shipping stuff ahead, you would do best to establish a contact where you are going. Guns are a no no unless going to an FFL
Get the animal cleaned. cooled and skinned ASAP. It is usually quite warm during season.
A pair of good walking sticks like Komperdels are an excellent idea and can also be used to steady the rifle. First pic is first 08' tag, 270 M 70 w/BOSS, Trijicon 3-9, factory Remington 130s, 350 yards (second longest shot in 11 years), second is second 08' tag 300 Savage M99R, 1.5-5 Burris, handloads w/130 TSXs, 81 yards.
Both were taken with 1/2 mile of the other, 1 mile from home on state public hunting land.
If you do come up our way, drop me an email email@example.com
and we can probably get together.