The first is Load Range C and has black letters on both sides. The second is load range SL and has white letters.
Here's Dunlop's page on the RT: http://www.dunloptire.com/products/tire.html?tire=radial_rover_rt
It has a typo in the heading for the 4th column, it should be max load for passenger car use.
Load ratings explained .

What are you doing looking at the dinky little 235s anyway? laugh Get the 31s!

Brent
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