If you do decide to go with a slide, you might want to put a priority of being able to still use the truck camper when the slide is in.
This was definitely one of our priorities - it falls under one of our prioritized categories, functionality.
My DW has had the same thoughts about the use of the truck for dump runs and the like, but fortunately she is a confirmed TC addict for the same reasons many have mentioned. We kept our TC even when our sons got bigger, and tho it was a little bit of a squeeze for them we all have nothing but the fondest memories of our camping treks. Now we have a much bigger and better TC and take the grandkids (still not teenagers) with us. We have an outside shower that serves us well. We're totally happy!