Clutch
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I dunno. Seems like a lot of work for you flip-packkers if you want to use the whole truck. It's hard to argue with 20 minutes to off my TC and have a whole empty open bed. Without either some form of crane system, or some extreme carpentry work to just go ahead and 'make it a slide-in'. I think I'd do what I did, and buy an inexpensive used pop-up TC of some sort and give it a try. It's going to cost you about the same as a new flip-pack, and it will probably already have a heater and a fridge in it - so you've hit several birds with one stone.
In my case, my camper is actually larger than my truck bed, so in some cases I can fit more crap in there with the camper on than without (depending on the type of crap, that is)
Just leave the FP on full time...use it like a normal shell. I have a open trailer for anything too big to fit in the truck bed...takes minutes to hook up a trailer.
I have owned pickups for 26 years now, they all had toppers...think I pulled the topper off for about a month on my current truck...didn't care for it and slapped it back on. Nice to have that closed in space for a variety of things. I just toss my camp gear in and go.
Unless you're living full time in a TC...you'll get your money worths out of a FP if you use daily as a topper. TC's generally sit storage waiting for the next trip.