I have put larger tyres on my '40 , so I can carry the camper ok .
I have had the 15" rim turned off the artillery center and a 16"x7" rim welded on . I now have 245/75 16 E load range.
These seem to measure 30" dia.
I wanted to retain my hub caps , so this has been successful.
edit , I have changed the diff for a '56 unit 3.9:1 and with these tyres , 60mph is 2625rpm . Easy to achieve with the 216.
ps, I have just read you have a 235. My old '56 truck with 235 and 3.9 diff would do an easy 70mph , so your 4.1 diff should still be good for 60mph, assuming the engine has a bit of life left in it
