Took a lot of work and fiddling, but here we are! The big thing I learned is why my grandfather had one of his rear wheels set to wide stance and one set to narrow on Bror. It was because if you have it on the narrow stance, you can’t fit the rototiller onto the back of the machine.
Also learned how to get the fluid-filled tires onto the hubs. Set up a piece of thin board onto a wooden dowling to use as a ramp, then roll the tire up until its in the right spot.
Looking for paddle tires and tractor wheels for 5 lug ford 1600, I have turf tires on it now, but they spin with and pull behind load.
The type of tires you’re looking for are commonly referred to as “Ag” or agricultural tires, or sometimes called “bar” or “lug” tires… Like these: