Biermann, in Alberta I expect similar to Saskatchewan next door where my trucks are you won’t have a problem finding someone to work on them
All the tire shops know about split and multipart rims still being used in trucking and agricultural equipment and old vehicles used daily
However you will be mildly disappointed with the options for a 17 inch tube tire to mount on that rim
If you want a decent load rated working tire
You option will be Samson tracker XL in smooth highway tread rated for about 3000lb per tire
There is no good ground grip option like the one in your photo for these old trucks.
You don’t need to balance the wheel
The truck won’t go fast enough with that 5.14 rear differential.
-s