If you go here
https://www.michelinman.com/auto/tir...s-crossclimate and select 16 inch rims sizes, and go down the list of tires, look at the ones WITHOUT LT in front of the size. All of these will end in a C and these are the tires that the OP is referring to. For example 225/75R16C 121/120R LRE BSW which is a common motorhome size for Class C. I think this is what my '06 Sprinter chassis used.
MSPN
70411
Mileage Warranty
Standard
Section Width on Measuring Rim Width
8.00" on 6.00"
Overall Diameter
29.32
Max Load, Single (LB @ PSI)
3195 @ 83
Sidewall
Black Sidewall
Revs/MI
710
Tire Weight
37.04
Rim Width Range (Min/Max)
6.00-7.00
Tread Depth (in 32nds)
11.5
Here is the same tire in the LT version
LT225/75R16/E 115/112R BSW
MSPN
72022
Mileage Warranty
Standard
Section Width on Measuring Rim Width
8.00" on 6.00"
Overall Diameter
29.32
Max Load, Single (LB @ PSI)
2680 @ 90
Sidewall
Black Sidewall
Revs/MI
710
Tire Weight
39.99
Rim Width Range (Min/Max)
6.00-7.00
Tread Depth (in 32nds)
12.5
These tires are only made in 15 and 16 inch and in very few sizes. Only three or four manufacturers make them, or did the last time I checked.
Charles