You can easily go to skardu and these places in your bolan...if you are 7 friends and having 2 or 3 drivers..i will advice you that if you leave naran 08 oclcok in the morning,,you will easily make it to skardu for night...
chilas skip hojaega...but in that case you will reach skardu at night upto 09 pm...
and for bolan yes it can easily make it there no issue..babusar is steepy,,just make it sure in return from chilas to babusar...don't give your bolan second gear...make it in 1st all the way in last some steeps...and its a 40 km track...take care of your radiator...after every 5 to 10 km ...there are alot of water streams on the way..