Found this one. But have not made one, maybe this will give you an idea to design your own. Looks easy enough to make. Here is a link that might be useful: cowboy cooler

We kind of flip flopped with the sleeping situation. DD dated someone for 2.5 years post college but they lived in separate cities 2 hours from each other (we live 6 hours from her). He came here twice and we put them in separate bedrooms (all of our spare rooms have twins, with one room having a trundle). That was our first experience with a BF/GF staying over so I think we just weren't ready for it yet or maybe because it was DD, not DS...I'm not quite sure. Later, youngest DS moved to Chicago after college and dated somone for a year, then they moved in together. When they came to visit, it seemed kind of dumb to have them in separate rooms since they were already living together. I set up the trundle but they ended up squishing into a twin....ah young love! I like your criteria MTN of working adults.

Thank you. My goal is that this becomes automtic but until then this is just what I needed. :=)

Probably easier to use a ice chest for the cooler. If you desire the old drain spout you could connect the existing drain on the cooler to your desired spout using a little rubber hose and a couple of clamps. Should be able to design one using some 2'X 4' for the legs and build a box to fit your cooler. I have seen them but don't know about any plans for one. Just do your thing, you may come up with something better than using someone elses pattern.