It doesn't look like an RH-5.

I don't know the official designation for these, but I do know that they were made by a number of companies including Budd, Firestone and Motor Wheel. One of the wheels on my truck is actually made by Kronprinz, in Germany. It must have found its way on sometime during the truck's time in Europe.

This design was used on many different vehicles.

The wheel in your post looks very similar to these.

There is a write-up here that details the disassembly and reassembly procedure. (Note, there are several posts in this thread that outline the procedure)

Link

Make sure to pay special attention to reassembly procedures - especially inflation. If done incorrectly, or without proper equipment, they can be extremely dangerous. If you are unsure about working on them, you may want to consider taking them to a shop that specializes in large truck tire repair.

Best Regards...