There are lots of tips on loading. But your wife doesn't want a family feud each time you load.
I solved it by learning to load by myself. I can accomplish this in about 1/2 hour. Requirement? Have a strategy and lots of patience. I probably exit my truck 3 or 4 times to double check what I see in my mirrors. At first, it will take longer. As you gain experience, the process will become routine and personally satisfying.
My key strategy, but not the only one by any means, is watching the clearance of the side rails from the camper. I can see it in my mirrors and double check on the ground to be real sure.
Rick