4" frame, single axle with GVWR up to 5,334 lbs.

6" frame, tandem axle with GVWR of 7,350 lbs.

6" or 8" frame, tandem axle with GVWR up to 12,600 lbs.

6" or 8" frame, triaxle with GVWR up to 18,900 lbs.

Bridgework triaxle with GVWR up to 22,050 lbs.

Quad axle with GVWR up to 33,600 lbs.

Gooseneck/Fifthwheel quad axle with GVWR up to 36,800 lbs.

Model 420R616SHR with step hull bunking