Among many toys I got to work on was this camper motorhome play set for Mickey and friends.
I recall at the time there were a number of other concepts being pitched internally and to Disney, this was part of a batch. As a result there weren't a lot of iterations going in, they just knew they wanted a motorhome that expanded into a fun play environment.
I went with a retro body style, working with the shows' motif but inspired by reference I found from old Disney cartoons and my affection for old teardrop campers from the 1940s.
The rest was taking these basics and blowing it out into something theme appropriate, play interactive, and very 'Mickey'. The vertical climbing wall roof feature was the only stretch, conceptually, I had also considered a rooftop deck.
.. anyway, here are the concept drawings as pitched;
Here is how Mickey's Camper looked when it came out.
It's clear the size and features went through some minor changes, but the exterior is virtually identical to my design.
..I do like the added pull out awning;