New (to me) Lance 815 truck camper owner. Got a few q's

truck campers are way smaller than 5th wheels my ac will keep my big lance nice and cool. There have been times where it never dropped below 110 out in the desert at night and it was so nice to sleep in a cool camper. 100 or so pounds is got going to make a difference in cqrrying my 4600# camper. I don't even notice a difference when I added 140 pounds of kayaks up onto the roof for trips when i had my SRW with 19.5 tires, sure don't notice it with my dually.