At the Rally we just did the following to our 2015 GK.
8k Axles, Center point air suspension, Back up camera, Air Flex pin box, Bronze grease type bushings, Disk Brakes, Goodyear 17.5 "H" tires.
For only one reason we feel safer on the road.
We had all the Lippert stuff was done at Lippert and the tires and Disk brakes with Ron, on site.
Also we did the aluminum stairs, the new dump hose system and their new bed (These 3 were the best $$$$ spent

LOL)
But honestly if you go and get your unit weighed you will do these changes. I'm sure. We try really hard to keep the stuff down to a minimum, travel with max. 10 gal of water and when you weigh the unit and your 2 axles are just shy of 13,000, you have 2 - 7k axles and "G" tires. For me that is too close on the tires and axles.
And you know what they paid for them selves on the way home. A young girl literally went through a red light and when realized it STOPPED right in front of me. Truly she was lucky...