I bought a 2012 Suburban in great mechanical and cosmetic shape except that after riding in back about 3 weeks after purchase. I noticed that it is very bumpy. It's even worse hauling our boat. It jumps to the right and to the left. I have no lights coming on on my dashboard. Wondering what the problem might be.

 

I'd start with replacing the shocks. I tow heavy with my 2500 Suburban, and Bilstein 4600s have been great.

 

Does it have the air adjustable suspension? If so make sure the airbags are not blown and the air pump is functional.