Roads are rough and can take a toll on even the best built trailer. The MORryde AllTrek 4000 is designed to protect your trailer all the time, wherever you tow. With 4" of suspension travel, the AllTrek 4000 can protect your house on wheels from those harsh, rough roads.• Provides 4" of suspension travel• Bolt-on â no crossmember required• Over 40% more rubber for smoother, more comfortable towing• Protects trailer from damaging road shock• The most rigorously tested MORryde equalizer suspension to date• Includes 2 equalizers for one tandem axle RV Bolt-on no crossmember required Includes 2 equalizers for one tandem axle RV with 35"" wheelbase | MORryde TG2-35 AllTrek 4000 Suspension, Tandem 35" Wheelbase