I have dove the math many times (I’m a NABCEP certified installer), for both residential installs and RV, water pumping, etc. Calcs on an RV are very difficult to really be accurate with, since you are always in a different place and always positioned at a different azimuth. 40% might work out on paper for perfect conditions IF you always had your RV parked in the same place, at the right orientation and IF you actually tilted the panels every time you could. In reality the gain is much less than than 40%. There’s a good reason nobody uses trackers and tilt adjustments anymore in residential and commercial installs. It just makes more economic sense, if you have the space, to add more panel to make up for the losses of a less than ideal tilt (or azimuth). By all means if you don’t have the space, tilt and azimuth adjustments are about all you can do.
