I was going through a 70’s playground equipment catalog (more on that later) and was amazed to discover this, the “Swim Mobile” a portable pool that you drove into places and events to provide comfort on a hot day. I always thought it was just something imagined by the writers of the Simpsons.The “Swim Mobile” is much nicer than it’s companion piece The “Boxing Mobile” which is a portable pugilism display system.
AKA Brian Heiler author of "Rack Toys: Cheap, Crazed Playthings" and co-editor of "Toy-Ventures Magazine". Co-Host of the "Pod Stallions" podcast. Host of the Brick Mantooth Youtube channel, painter, designer, writer, mental health advocate, toy collector, Mego, and Mego Knock-Off enthusiast. I have large feet, ADHD and I live in Canada. Talk toys, not others. 
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I was in a poolmobile in Detroit in the late 60’s. As I recall, it was a hell of a lot of fun.
on the dvd commentary track for that episode, one of the writers mentions having one of them in his neighborhood. until then,i thought they had made it up too!
Wow that is great can you still find those ? if so where and how much ?http://www.portablebeds.com/