Mine turned out to be a striker plate adjustment. You could shut the door, but it never would shut tight enough, thus rattling. On ours, the striker has the first piece of metal it hits, then there is an inner piece. Both have the square cut out for the latch to go in, but inner one is a little further in. Hard to describe without a picture. A little finaggling with a big flat head screw driver and a little bending on the striker plate where the door would latch to the inner piece, and all is tight now. I do plan to later remove the striker and add some metal (weld) to make it latch even better. A little metal added, a little dremmeling and it'll work even better.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.