The Jayco will be over 9000 pounds loaded with 1200 pounds of TW.
The KZ will be about 8000 pounds with 1050 pounds of TW. Both of those will likely put your truck over rear axle and GVWR. I do not recommend either for your truck. You should ask for feedback on how many half ton owners tow over 8000 pounds loaded RVs and how comfortable they are towing under all conditions.
What is your as equipped payload per the Tire and Loading Sticker on driver's door. Note what your truck has where mine says 2051:
I think a target of 6k dry is a better match for your truck. That is the comfortable limit for most half tons owners pulling RVs. Power and transmission gearing has improved greatly over the last decade which leads to significantly higher tow ratings. Payload and suspension components are have as much to match carrying capacity.