Had my Truma installed today. Overall it went pretty smoothly but we had some Trailmanor specific issues that had to be addressed. First, the old hot water heater was suspended about 6 inches off the floor and the Truma ideally should rest on the floor. So the hole in the side of the trailer was higher than normal. The frame that held the old hot water heater up needed to be modified as a result. Second, the propane line on my Suburban hot water heater came in on the left side and the Truma expects it on the right side, so a little engineering needed to be done. Finally the opening/closing issues of the Trailmanor came into play but on first blush the cover did not appear to impact the "feel" of the opening and closing of the trailer. (The cover sticks out about 3/4" more than the old one. Because the trailer folds up quite tightly on its sides, we were worried that it might hang up on the new cover.) In addition, there is a vent for the grey water tank that was right there and the Truma cover came slightly over it, so again, some adjustments had to be made.
Now that all of that was done, off to hook it up to water. Turns out that the water pressure at the place the install was done was pretty weak. Water basically trickled in to the city water connection. We thought about just putting water in the fresh water tank and using the water pump to get more pressure, but decided to test it anyway. HOT WATER !!! So, they really do have something different for lower water pressure situations. We ran it for 15 minutes and continuous hot water. So, tomorrow, I will hook it up to my house water and give it a more vigorous test.