Join Date: Jun 2016
Location: Orange County, CA
Chassis: Crown Supercoach II (rear engine)
Engine: Detroit 6V92TAC, DDEC 2, Jake brake, Allison HT740
Rated Cap: 37,400 lbs GVWR
RV flat roofs are notorious for leaking - water pools on them, then works it way into the walls and rots out the whole structure. Curved roofs are intrinsically stronger and won't allow water to collect on them. Why not do a roof raise, keeping the original roof itself, then you can make a flat ceiling inside to hide insulation/wiring/aircon/etc? That has been done before. Or buy a low-floor transit bus - lots of headroom, flat-ish roof and ceiling, then you can make a floor above the original floor to hide tanks etc below and still keep enough headroom. Lostranger has done that on the Nomadicista forum with a Gillig LF.