The wheels are not the RH5° kind. They look like the three piece kind which I consider the safest type of wheel made for tube required tires. I use ISO 46, but for older equipment, I would recommend ISO 68. If it raises all the way, it has enough oil. Don't overfill it, or fill it while the hoist is extended. Is it a farm truck or a gravel bucket? Heil built gravel buckets, but I'm not sure about farm beds.
