@saibiq bro..
You can pitch your camp in hotel's camping area..
But weather is usually very hot in chilas so camping there is not a good idea.
Baltistan mein itna farq nai parhta room rents ka.. jaise naran or murree ka parhta hai..
Ziada barha k nahi mangte.. standard rates se thora farq hota hai..
And after atleast 12 hours drive.. i think you should go for a room
And yeah.. shangrila hotel chilas will require advance booking as it will be full in eid days.
There is less chance of shortage of fuel in this area.
Remember to fill your tank from balakot. If still you feel like your vehicle aint gonna make it to chilas or any doubt about shortage in chilas or jaglot then fill it again from naran. Otherwise dont need to fill from naran as i really doubt there fuel quality