I use only one, and I can't imagine any 2 wheels being closer than mine. I think that it made a WORLD of difference on our camper. I don't even think I need 2 of them. Mine is the standard BAL X CHOCK. Randy
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/SIGPIC]'08 V-lite Flagstaff 30WRLS
'06 Ram 1500 QC hemi Reese dual cam sway control,
K&N series 77 intake, Hellwig helper spgs. LT tires,
Flowmaster "true duals", 380 h.p., Bilstein shocks
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