6’6 Interior height; 6″ Ibeam; Rear ramp with spring assist and flap; 4 d rings in floor; 36×75 RV door; 16 ft and above beavertail with ramp; 24 ft and above have 5200lb axles; 28ft has double 6″ Ibeam frame; 30ft and above have 8″ Ibeam frame and triple tube tongue; (2) 12 V Dome Lights with Switch26ft and above have amber turn signal over the wheel well; 26ft and above have DOT Tap