Another Roof Repair ??

[barryc1946]

We bought a 1978 Road Ranger 5th wheel. the roof is sagging between the truss's [alum roof panels]. I got the bright idea to drill some holes and put foam insulation {great Stuff} under the panels to raise the roof backup and increase the insulation value. It actually worked, the rear section came right up and is nice and solid. The front section however is another story the support board that holds the roof to the wall is rotten, I can't spend a lot of money on this we paid 2k I'm looking at more than that to fix the roof. I'm wondering if anyone has a idea about 1/2 a*$ing this back together at least so we can enjoy this for a couple of years.
Thanks in advance
Barry