Fellow golf cart owner here. Mines gas and I can’t wait for it to die so I can convert it to electric and race for slips.
General rule of thumb when searching tires:
So 3.00-4 tire would be a 10" tire with a 4" hub. Most offroad wheels we use here are 4" hubs. Bergmeisters, sixshooters, and a couple others are exceptions… Those hubs are a bit smaller diameter.
Roadies:
https://a.aliexpress.com/_dXYll58
Offroad:
https://a.aliexpress.com/_dUulBs6
Getting a hub wide enough to fit 10" wheels without a big bulge is the tricky part. Mbs fivestars take them barely. You’ll be looking for widened or spaced out hubs otherwise.