I've used a moto jack rack hitch carrier for 5 years and am very happy with the unit. The ultimate mx hauler is also very solid and almost identical in design to the moto jack rack. On the SMB, it works fine with the standard hitch receiver. I've got the spare tire on the back and it clears with 1-2 inches to spare. There is a screw adjuster to reduce sway and on the SMB it is very secure when driving.
2006 SMB 4x4, EB-51, 6.0psd