Hello,
I have designed my own little rover which fits in a 2.5m service bay and thought u guys might like it, it has a mystery goo on board and a thermometer and pressmat for getting some small science data, its relatively stable on the mun and for added convenience you can stow it back inside and secure it back in using the CC-R2 connector ports from KAS
https://imgur.com/a/gcBEe0C