Need shock advice!!

Hey guys, I have a 2001 Tacoma double cab with a 6" fabtech suspension lift with the original fabtech shocks still on. I'm planning on installing 1.5"-2" rear shackles just to eliminate the little sag I get when I use my camper. Rear shocks are all worn and I wanna replace them. What size and brand should I go with?? Was looking at some Bilstein 5100's would they fit. Keep in mind I'll have about 1.5" extra lift from the rear shackle. I do some off-road driving once in awhile and don't want the ride to be to stiff, want a little flex in the back also. Lmk what u guys think!