i have a 2007 f250 super duty diesel with the 6.0 whats the max i can pull will the 5th wheel

That depends on several things. Your 5h wheel set-up greatly increases towing capacity, as opposed to a ball or pendel hitch (a ring), and with proper brakes on your trailer, either magnetic over electric brakes, straight electric, or you can even get an aftermarket air brake system. As far as engine power: no worries. Make sure you have an aux. transmission cooler for automatic. You can pull a 40ft, 5 ton easy. Legal? Whole different ballgame.

PS Avoid surge brakes, hopefully you have the towing cooling package, and depending on your State (and Federal) laws re: weight, make sure you have a Class A drivers license or make sure you don't need one

I do have the cooling system i have the factory towing package with the digital read out in my dash. my 5th wheel has elect brakes on it

You're good to go. Enjoy