I pledged a Kickstarter not too long ago for some 3d printed pieces for RPG games.  They came shortly after the KS ended and several of the pieces I got were wagons of different types.  A prison Wagon, a giant prison wagon and a Gypsy wagon.  I loved all three pieces, but I wasn't so in love with the wheels that came with them.  Luckly for me, I have a 3d printer myself, and I got online and in no time found some wagon wheels (thanks thingverse).  Here are a few photos of the wagons with my new wheels on them.