Welcome to the forum!
No air shocks for the Patriot that I know of.
Since you have a 2008, the springs might be old and tired.
You could try replacing them with stock along with the above mentioned spacer, or consider a stiffer rear spring.
Another member used springs from a Dodge Journey to solve a similar issue:
I wanted to post up here in case this will help anyone out. My aim with the Patriot is to work with its strengths instead of trying to turn it into something it's not, so lift kits and big tires weren't really on the radar but I did go slightly bigger than stock on tires with 235/75R15's on...
www.jeeppatriot.com