I believe that the adventure park between Big Spring and Stanton does as well. They have a large dry lake bed that clearly has tracks wider than a quad, in any case.
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Tony Eeds aka Teeds aka Dad aka Grandpa aka
TMTC President
'06 DR650
'02 200MXC
'01 400MXC
'00 XR650R
'72 DKW
'71 Penton ISDT