My recently purchased 5th wheel is rated at 149 inches tall. My shed door opening is 145 inches. The floor in the shed is concrete. The side walls of the shed are 168 inches. There is plenty of room t...
Unless the apron is sloped which means the trailer is getting higher the closer to the door. Better to measure the actual height of the trailer on level ground and hooked up. Then measure the door.
At the least pull the trailer up until just before it hits the door and see what you need, realize the trailer might still be rising in height because the wheels are behind the highest point (usually).