1 . very tough question , kutton has the amazing powerhouse resorts which is awesome place for night stay , keran has the view of indian occupied kashmir . u have to choose 1 between these two . meanwhile camping facility is easily avaialable at keran and shardah.
2.uptill shardah , any car can go , dont take your vehicle ahead of shardah if u care for your vehicle.
- dudipatsar trek is pretty hard one , means u have the ability to do ratti gali too i guess
4.arang kel has only 1 hotel , musk deer resort , u can contact them through their page on facebook , meanwhile taubatt also has few hotels , dont know about the facilities..
hope i answered your questions well , cheers