Advice on Grand Teton Loop

“First time to western mountain range. Done other mountains and deserts, though. Camping at Cascade South Fork, Alaska Basin, Death Canyon, Phelps Lake and Bradley Lake. Appreciate advice on following: 1. Is strong three season tent (using 20 degree bags) sufficient? 2. What are day/night temps and winds at altitude? 3. Suggested clothing other than usual rain gear and fleece layer. Any need for gloves, fleece hat, etc.? 4. Any other advice? 5. Are there trailhead shuttles? Thanks.”