OP wrote:
On the other hand trailers allow canopies, and things that go into the back of the truck. But the drawback is when you take the truck to go shopping, you take the goods in the back too.
I don't understand this sentence - by "canopies", do you mean a bed cover or do you mean a shelter from the sun? I put stuff in my bed like chairs, bicycles, and the honey wagon. I leave all this stuff with the camper when we go off in the TV to shop or sight see. I also use a locking pin on my hitch receiver. I used to be more concerned about theft so I have a length of chain that I can use to secure this stuff when not there.