The Roadmaster Crossbar-Style Base Plate Kit (XL) # 3141-1 is the correct kit if your 2010 Chevrolet HHR is not an SS model. It is compatible with Roadmaster tow bars using the Quick Disconnect Crossbar Assembly # 910021-00.
The Roadmaster EZ Base Plate Kit # 523159-1 is the correct kit if your 2010 Chevrolet HHR is the SS model.
We do have the wiring you would need to operate your HHR's tail lights when flat towing.
- Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles # RM-152-1676-7
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The differences between the Draw-Tite # 24756 and the Curt # C11447 trailer hitches for your 2008 Chevrolet HHR are that the Draw-Tite has a welded tab that keeps you from using Class II trailer hitch rated accessories and it doesn't have a collar while the Curt doesn't have the welded tab and it does have a collar. The Curt also requires the use of a stabilizer strap # 18050 for all non-trailer accessories like a bike rack or cargo carrier.
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