Congratulations on the new trailer. What ever truck you decide on, with a three slide trailer don't over look a 1 ton single rear wheel truck. I also have a Cummins but all three make good trucks, except for the Ford 6.0. Go to some forums and do your homework.
2011 Eagle 330RLTS with just about every option.
2017 Silverado 1500 4x4 5.3 with tow package. (no, we don't tow the Jayco with it.)
2018 Surveyor 265RLDS well equipped.
Life in the slow lane is still life.