Either of those trailers, with two heavy JK's is going to be a minimum of 13,000 pounds and could be up to 15,000 pounds.
My 20' GN is 2900 pounds empty. So that 15,000 number is likely pretty close.
I looked at the diesel + big @ss trailer combo for months. Really wanted to do it. Just couldn't justify (or swing) the additional cost since I wanted a new truck... But it would make the Moab trip a breeze.