Overall, I won't likely get another truck cap. While you gain on weather protection of cargo, you limit cargo height (think refrigerator, garbage cans, etc.) and severely limit vision from the inside rear view mirror (like looking through a small tunnel with a low overhead).
IF you do get a topper, getting a ladder rack on it is extremely useful. Lift up sides make it easier to get stuff forward in and out, sliding windows work better for dogs or for simple truck bed camping.
I just went with a folding tonneau cover on my new truck. Easy to fold up and fairly simple to remove entirely if needed, by one person. The one truck cap I owned was a fiberglass LEER (very heavy) on a "long bed" mini pickup and was a two man grunt to move, four people MUCH better. There are lighter weight plastic and aluminum toppers that would be easier to handle AND not be a significant cargo capacity drain.
Once you buy the topper, probably not looking at 5th wheel trailers in the future with that truck.