I have a 2010 Express Passenger van RWD 2500 135" LS. It seems like the only heavy-duty shock replacement is the Bilstein 4600. Any reason NOT to install these?

 

Gabriel and Monroe also make Heavy Duty shocks for your van. The Bilstein's are three times more expensive than Monroe's, not sure if they are worth it. I use Monroe's, but my van is a 2008 1500, that is not used for heavy duty hauling.

2010 CHEVROLET EXPRESS 2500 4.8L V8 Shock Absorber | RockAuto

Or try GM shocks, will have to check for exact shock for your van.

https://www.gmpartsgiant.com/parts-l...ion-front.html

https://www.gmpartsgiant.com/parts-l...108f9a3bffda65

 

I also use Monroe shocks. I have used Bilstein and have not had good luck with them. Better bang for your buck with Monroe!