I'll share what I can.
First off weight.
I have a Finch shell model (with couch) on my 09 Tacoma. It was purchased from a guy with a truck like yours, double cab shortbed. It hangs out on a shortbed but with my truck I can close (and retain) my tailgate. I recently weighed my set up with full camp load out and it came to 6400 lbs. That is a lot of weight. I've got OME coils up front and their leaf pack with AAL in the back, Billy shocks/struts, and Wheelers bump stops front and rear. When l am fully loaded I've got about 1-2 inches above the bumps in the rear. If you end up getting a FWC I suggest airbags. I think it will be easier on your truck in the long run. My camper doesn't live on my truck and when I take it off the truck is raked forward. With that severe angle the drive shaft has some vibrations in 1st and 2nd gears. This is with the angled shims from Wheelers too.
2nd:Camper type
Since the Finch is no longer made I believe the Swift is the replacement. The Swift is wider. While I don't like the extra width and can camp for a week in my set up I understand some may want that extra elbow room. I'm sure it is nice for packing gear. Since mine is a shell model the only thing I have is my couch and a Lagun Table Mount. This has worked perfectly for me. I spent 10hrs in a rainstorm inside the camper and the table was really helpful. When not in use it swings out of the way. I've never had want for a dinette. I prefer to cook and clean up outside the camper, shower included. So far I've been using a solar shower bag and it works for me. As others have noted there are many campgrounds that offer showers. Last summer I fabbed up a plastic solar shower pipe device but haven't tried it out because it adds a lot of weight up on top of the camper and my internal lifting struts aren't up for the challenge. I need stronger weight struts.
In my setup the fridge is behind my seat in the cab. Therefore no space it taken up in the camper. I have a 2nd battery system which works with solar controlled by a CTEK D250s. The camper plugs into the cubby in the bed. Battery us used for camper power-lights (internal/external) and a fantastic fan. My fridge and spotlights are also hooked into the 2nd battery.
There's a thread here on WTW for used campers. If you check that out you may come across something that suits your needs. Deciding to buy new is a tough one. It seems that FWC has raised prices every year since I've been sincerely following prices. New is great and mine was only a few months old so I essentially bought out the rest of the loan with my own loan. Pretty basic.
Think that's all I can share. Check out my build thread listed in my sig. If you have any other questions that's what we're here for. Welcome to WTW and good luck.