So I know you're all going to laugh, but the last time I was in a RV Supply center, I couldnt bring myself to spend the $29 for the Water Filter Holder.
I hate when my water filter lies on the ground as when it's on it's side, it tends to leak, causing the ground to get wet around it and it's sitting in a puddle of mud. I always keep a ball of twine in the storage locker and thought if I make a quick loop, it'll hang off the back bumper keeping it off the ground and dry.
The ball of twine costs a $1 and since I keep it on hand for all sorts of campground needs, I always have a hanger when needed.
Just thought I'd pass along one of my many Redneck ideas on how to save money....