Looking to buy a new Ram CTD. If I tow a 16k pound 5th travel trailer 3-4 times a year, which is the better value, 2500 or 3500? Did some building on the Ram website, and the cost spread is not that drastic, even with the CTD HO and Aisin on the 3500. I have not towed a trailer that large on coil overs, so I am leaning to the 3500 because of the leaf springs.