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That truck is an '84 or '85. "A0"...It's an 1989 with a cummins non turbo and allison 5spd. I really need to go a larger tire, have seen alot of the 9 series truck running the 53" tires but didn't really consider any "Cons" over all the "Pro's" to having them in the deep sugar sand. I've seen these trucks with the duals 11" have a harder time through the sugar sand when pulling a camper and then the same model of truck with the 53's more or less floats easily through.
16.00's would be just fine in your application. 395's would also be fine.
5th wheel camper doesn't really qualify as "heavy" in the context of these trucks.
Those hills on I 25 are going to slow you down no matter what, 395s later than the 16.00's but you're going to end up crawling up them either way.