Trailer clearance

I have a 2011 Coachman Catalina 22FB. The black/gray water dump valve has between and 5 and 6 inches of ground clearance. This seems really low compared to other campers. Is this low clearance going to cause problems when I go out west (especially in the National/State parks)?

If you are concerned (and it appears that you are) re-position the axles and you will gain height advantage. You probably will have a bigger issue with gas stations and driveways than national and state parks.