I believe I ended up adding 100gp to the cost and 150 inventory slots capacity. They want a rolling wheelhouse, I just need to let them find a noble with an unattended stable now.

Good points on having extra storage space with the rigid structure! I reduced the slots slightly to accommodate for the weight and to keep the hex crawl rolls the same.

I LOVE making shopkeeps and various NPCs retired "high level." Tends to teach a lesson about how you can't just hobo every business and towns person without repercussions! An insane little boxer sounds right up their alley too!