For an accurate maximum height determination, you have to be hooked up, level, with all tanks empty, tires at max pressure, and without most of you normal loaded stuff in either the TV or the camper. I have tried 3 times to get a good measurement with lots of variance. On level ground, set up a laser level on the highest point on the camper against a wall very close to the side of the camper. Then measure up to that point from the ground. My most important factor is that my roof is curved from side to side, making most methods inaccurate. Don't trust factory figures at all.
2011 Sabre Silhouette 260BHS
2006 F-250 6.OL