The MORryde SRE 4000 provides over 4” of suspension travel. This gives you the smoothness you need with today’s rough roads as well as the protection of your trailer from damaging road shock. The SRE 4000 also provides added strength as each SRE 4000 includes the X Factor crossmember. The X Factor is designed to provide added lateral support resulting in greatly reduced frame stress. Your trailer is now smoother and stronger than ever with the SRE 4000. The SRE 4000 with the X Factor crossmember bolts into the existing frame hanger.