16-18 pulling a camper? I think whoever told you that is high. getting 10-12 should be about right. A programmer will get you better mpg too. Really all depends on your budget.
Yeah unless it limps or slips clutches you are ok. Anything over stock hp/tq ratings your trans life will lessen. I would take what is said on DP with a grain of salt unless its ben, mikel or crafty1.
Nitto is the discount brand tire division of toyo. They may be manufactured the same way I am not sure of that. And unless he is on the assembly line he does not know either.
wow 75k is good. I got about 50k or so out of my pro comps. I say look into the hankook or spend a bit more and get toyo. Nitto tires are just cheaper made toyo tires, not to say that people have used them with no success but when it comes to tires I don't care how much I shell out. I would just...