I did the same, thinking about a FWC, but went with the access cabTundra (Toyota, confusingly, calls it a double cab) for that very reason plus cheaper to buy and build as well as more nimble offroad with 5 foot smaller turning diameter and IFS.
Went with a topper type poptop (Ovrlnd) to keep weight down and far more interior room without stuff I didn't want built in. No way I’d want it on a 5.5’ bed. Very happy with the combo. Still have lots of back seat room too (there’s just two of us).
