If you are riding into Ladakh on a Royal Enfield, it would be best to not have a pillion. The pillion space can be favorably used to tie up your luggage. However, for short trips, where you needn’t carry much, a pillion would be a great idea to save fuel. In general, it would be a comfortable enough ride for the pillion but in some places it can get very jerky and the pillion might want to get down and walk.