The adjustable tongues are not the problem. It is trying to get the bottom of the front of the 5th wheel to be parallel to the bed rails, and about 6 inches higher so that we will have clearance when not on level ground. Also when you adjust the front to clear the bed rails, the 5th wheel looks like it is pointing to the sky, and more weight is being distributed to the back axle than the front. It should be level so both axles cary the same weight. On the Jayco Eagle that I was looking at, it had an adjustment of 2" by the axles. That will not be enough. Jayco dealer says that the 5th wheel manufactures make their product for the average trucks, and the camper package is a option that makes the truck to high in the rear. We had the salesman, Service Manager and myself trying to fit our truck under the 5th wheel. With the 2 inch lift at the springs, and axle switch, and the most adjustment on the hitch, it would be close, but I do not want to switch the axles due to the high winds we have out here. So there is the dilemma. You are probably right about the Ford Service guy. Only thing that worries me is that Ford went from the 2" to the 4" spacers after 1999, so they must have found something wrong with the 2", due to it must cost them more for the 4" and you know Ford is not going to increase their costs unless they had to.