I would get the AC even though I don't use mine very often. A TC can get pretty hot baking in the sun on even a moderately warm day. The fanastic fan and portable fan I have do little to help cool the TC. A few minutes with the AC can make a big difference in comfort. It might also help with resale if that is a concern. As to weight savings, the AC unit is going to weigh about 90#. The loaded TC is likely to weigh over 4000# so your weight savings would be about 2% of the TC weight and way less than 1% of the weight of the truck and TC.