since this is a Forest River forum, are you looking for a FR recommendation or any recommended rear slide brand?
since not many rear slides are made, your choices are very limited.
Outback seems to have the most choices of rear slide floorplans and many have a king bed.
as far as i know, FR makes only about 3 rear slide floorplans. i'd recommend you look at the Surveyor 235. has the length you want and big bunks, with a king bed slide.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity