I just got my truck back after doing a completely custom 6.2 rebuild with Coated pistons made by mahle, among other top quality internals, banks sidewinder turbo system with banks exhaust system, peninsular diesel high output water pump for extra cooling, gear vendors auxiliary transmission coupled with a th400 HD, I got the coated pistons but I'm still not planning on having the egt's go above 1k. The one thing I don't know is the gearing of the axles it's a 4x4 dually so I'll assume they're 3.73's. What would the reasonable tow capacity be at 70 mph maintained, I only have a 2000# travel trailer so I would imagine it won't be a problem I'm just curious.