I don't have a Lance 1172, but I use one of
these or my clipper. I have a towel bar acroos from the stove by the door and this hangs perfectly on it. It keeps it up higher so the dogs stay out of it and it doesn't block anything. I did have to get a couple cheap clips to hold the top and base together - otherwise anything other than paper would drag the bag down.
For the trailer, I am still working on the best solution. Currently I just keep a narrow trash bin on the counter.
One thing with both is that I use small 8 gallon bags and take the trash to the dumpster every day or two.
1975 American Clipper RV with Dodge 360 (photo in profile)
1998 American Clipper Fold n Roll Folding Trailer
Both born in Morgan Hill, CA to Irv Perch (Daddy of the Aristocrat trailers)