I posted and watched for ads on a Liberty 17; took almost a year to connect with one, so patience pays off. Saved almost $7000 off a new one and the PO had already done several mods I would have done, saving probably another $500 and a lot of work!
I also needed the interior height. We've used several sleeping configurations, king, twins, and slept both sideways and lengthwise. The one we've settled on is queen size, sleeping lengthwise. Wifey is pretty picky as she doesn't like to wake up with a stiff back.
We dropped a 3" gel memory foam queen mattress (Costco) on top of the king cushion setup, and like it because that leaves 4-5 inches of space on each side of the topper where the side and back cushions can reside at night, leaving the "tunnel" on the floor open for storage or dogs to sleep in. The gel foam is easily trimmed to fit using an electric carving knife.
The gel foam topper is also super flexible, so it can be flipped back halfway during the day leaving a good seating area to use on the cabinet end without completely undoing the bed. Added a flip-up shelf to both end cabinets of the Liberty so we have a place on each side for eating.
The floor sockets were eliminated with laminate flooring and I used the table tops to make a portable table (stick the big pipe in between the two tops) that we can also use outside or break it down to store easily.
If we really want to undo the bed, the gel foam rolls up into a 12-13 inch diameter 60 inch long roll that we secure with sleeping bag straps and toss in the back of the truck. It's light
enough for 1 person to lift but simpler with two. If we make a quicky overnight stop, we just grab naps using the cushions on the seats in a twin configuration.
The 17 Liberty just has a lot more options for you to choose from than the others (my opinion.)