Since most TCs don't have built in generators, here in the SE part of the country, the weather deletes many of the TCs strong points. We are on our 5th truck camper and it is the first one to have a built in generator. But no way would I run that noisy thing and try to sleep in the TC, other than an emergency.
So here in the SE, when you see a TC parked for the evening, it is usually in a commercial campground, plugged into power so the AC is usable. We tend to either spend most of the summers in western Colorado or pass through there most summers. Once we get to the mountain west, we don't usually need AC in the evenings or at night to sleep as the outside temperatures cool off quickly once the sun goes down. Here in south Florida, it can be just as hot and humid at bedtime as it was in mid afternoon.
So if a rig is going to be parked at a commercial campground here in the SE, most people will opt to get an RV with larger space for the same money. As well as most Class Cs and Class As come with built in generators if a person wants to camp off the power grid.
We can drive all day here in Florida and we may see one or two truck campers. But let us get to Colorado, Idaho or Montana and about every third RV will be a truck camper, from past observations. Three of our truck campers were owned when we lived in rural Alaska. Only one of the three even had an AC unit and I don't ever remember using it. Not sure if any of them were ever plugged into electricity at all.
We use our 5th wheel when we camp here in the SE in the summer time, as we are going to be plugged into power every night anyways, so the extra room is sure nice. The TC is our long distance traveling rig, which gets used about 100 nights a year, during the summer months in the mountain west or the north country.