Thank you. Tires are 2010 and look almost new, I would think 4 years would be OK.
As to Jeep, my 6300 lb RV has a 2.4 liter 115 hp six cyl turbo diesel & a five speed manual & have pulled a teardrop with it. In my yout I drove a 1600cc Westphalia across the Rockies and Cascades. Just a matter of being patient and driving on the temperature gauge (and I monitor engines very carefully, GC has coolant, oil, and trans temp readouts).
Below was when I brought a toy home from Joplin a few years ago, have been driving rigs for a while. Crossed Monteagle on a July afternoon and never broke 200F.
I suspect the GC will be fine for me. Sometime maybe we can discuss the difference between a modern engine with VVT I&E vs a pushrod V8 from the last century. From what I've seen, people pull TMs with a lot less. Must admit I am tempted by the 3.0 TD with 420 lb-ft of torque in the '14 Jeep but not the $10k extra one costs.
ps am familiar with the CRDs, just like the Motori better.