Originally Posted by Brian B-P
There's no need to change the tongue length, although it might have changed anyway. The 25-degree turn inward of the frame doesn't need to stay in the same location relative to the front wall of the body -......
You are correct, again. I was doing some prep for our next trip, and got under the trailer and just studied it a bit. They make the bottom of the body flat where frame is contacted, but also the area around as well. My 17 extends over the point at which the angle starts. The determinant for where the body attaches is most governed by the water tank location next to a cross member.
The critical dimensions of tongue length seem to be determined by the space required for the propane base, clear of the tongue jack, clear space behind the propane base for attachment of brackets for a weight distrib. hitch, and then the storage box, including room for the box lid to open. There's still space (length) besides.