Two Questions for a Potential New Tow Vehicle

When I had our current tow vehicle built I ordered Dual 150amp alternators. We are thinking about a new tow vehicle and I have the option for the same dual alternators of 1 250amp alternator. Which is better for 5th wheeling and why?

Also I have the option of having the truck built with a 20k or 24k Curt Hitch already installed at delivery. Anyone have any experience with the Curt 5th wheel hitches?

Merry Christmas