The gold-standard of trailer suspensions. The CRS2 has adjustable coil-over springs that are tuned for your application. Also, the dual shocks on each arm gives un-matched ride quality. 

The CRS2 is also very easy to align. If you want the highest quality suspension, go with the CRS2.  

Also, unlike the Timbren, 5-lug bolt pattern wheels can be used.

To add to the Stud: $1000

To add to the Colt (Includes the brakes!!!!): $2000