Gene if you went with 7.50R16 tires on the rear and 235/85R16 on the front it would be the best combination.
The 7.50R16 are 14ply they have a load rating of 3100lbs each a 215/85R16 10 ply is only 2400lb load rating a 235 has 2700lb load rating.
a 3100lb load rating isnt that high for a 14 ply tire. i know of E rangee (10plies) that get more than that, although the extra plies will give you better sidewall stability if thats where the extra plies are.
what brand 7.4r16 tires are you talking about? not all 14 ply tires have the same ratings.