2001 tm model 3023

i just have a couple quick questions for anyone.  we went camping again for second time and i am having trouble with the rear bumper as a storage for the sewer hose, everytime i remove it from bumper for use it has little pin holes in it, i know the bumper just barely holds the hose and i do have some rust inside does anyone else have this problem? And last question is right below the stove there is a cupboard but if you look real close there is a gap between the bottom of the oven and the cupboard, in my opinion they should have made the filler board on top of cupboard to bottom of oven to fill the gap not just leave it short 2 inches short it looks bad quality wise. thanks in advance for any info.