In my web research I came up with the following links; hope this will help you along your way. Obviously not a lot in Utah or the surrounding area but I suppose that is to be expected due to the current availability of public lands. Figured in the very least the ones beyond the SW could at least give you some websites to look at.
Places To Go Wheeling Before You're Gone
Indiana
•Badlands/Attica
http://www.badlandsoffroad.com/ 866.762.2981
Ohio•Forbidden Zone/Wellsville (Hammondsville),
www.wellsvilletrails.com 740.219.9448
•Jeep Skool (Mantua),
www.jeepskool.com robocon@jeepskool.com•Painted Rock Adventure Park (Mt. Perry),
www.paintedrockohv.com 740.659.1171
Oklahoma•Day Adventure Park (Wyandotte),
www.ddayadventurepark.com 918.666.3411
•Hogan's Offroad Park (Disney),
www.hogansoffroad.com 918.435.8001
•Hurliman's ORV Park (Clayton),
www.indianmoundshorsecamp.com 918.569.4761
•Mr. Frieling's ORV Park (Clayton), 918.522.4244
•Rock Creek/Green Acres
Off-Road Park (Clayton), 918.569.4289
Pennsylvania•Outback Off-Road Adventure Park (Six Points),
www.outbackoffroadadventure.com/park.php 724.285.5082
•Rausch Creek Off-Road Park (Joliet),
www.rauschcreekoffroadpark.com 610.842.3596
•Rock Run Recreation Park (Patton),
www.rockrunrecreation.com 814.674.6026
South Carolina•Gulches Off-Road
Vehicle Park (Laurens),
www.gulchesorvpark.com 864.449.5698
Tennessee•Bold Springs Off-Road Park (McEwen), 931.582.6060
•Coal Creek OHV Area/Wind Rock Park (Oliver Springs),
www.coalcreekohv.com 865.435.0486
•Crazy Horse Extreme Off-Road Park (Waynesboro),
www.crazyhorsecanoe.com/offroad.html 931.722.3960
•Golden Mountain OHV Park (Sparta),
www.goldenmountainpark.com 931.644.9917
•Wheelin' in the Country (Summertown),
www.wheelininthecountry.com 931.964.3417
•Wooley's Off-Road Club (Lynnville),
www.woolysoffroad.com 931.703.3129
Texas•Brazos Valley Off-Road Ranch (Bryan),
www.brazosvalleyoffroadranch.com 979.846.1592
•Brushy Creek Motor Farm (Dallas),
www.brushycreekmotorfarm.com 972.524.2526
•Cline Ranch Off-Road Park (San Antonio),
www.clineranch.com 210.379.4146
•General Sam's Off-Road Wilderness Park (Huntsville),
www.generalsams.com 281.705.0078
•Hidden Falls Adventure Park (Marble Falls),
www.hiddenfallsadventurepark.com 830.798.9820
•Katemcy Rocks K2 (Mason),
www.katemcyrocks.com randykruse@verizon.net, 325.347.6333
•Long Ranch ORV Park (Llano),
www.longranchwheeling.com 512.755.5952
•Primitive Acres Guest Ranch (Mt. Enterprise),
www.primitiveacres.com 903.822.3983
•River Run Park (Neches River),
www.riverrunpark.com 903.724.4100
•Rock Creek Off-Road Park (Lipan), 254.227.1020
•Satan's Playground ORV Park (Ozona),
www.sp.orv.com rockkrawler@hotmail.com•Shiloh Ridge ORV Park (Rusk),
www.shilohridge.com 800.432.3965
•Texas HogWallow (Deweyville),
www.texashogwallow.com 409.746.2020
•Texas Race City (Florence),
www.texasracecity.com 254.554.1226
•Tire Trax Ranch Offroad Park (Rockdale),
www.tiretraxranch.com 512.373.6552
Utah•Area BFE,
www.areabfe.com 562.233.6523
Virginia•Big Boys Playground (Harrisonburg),
www.bigboysplaygroundllc.com 540.476.2044
Wisconsin•Apple Valley Farms (Chetek),
www.rpm4x4.com info@rpm4x4.com•Northwoods Overland OHV Park (Rib Lake),
www.northwoodsoverland.com 715.783.0191
Wyoming•Bliss Dinosaur Ranch (Weston), Bliss Dinosaur Ranch,
www.wyomingdinosaurs.com frank@blissnet.comCanada•Sault Trussel OffRoad, (Sault St. Marie, Ontario),
www.saulttrusseloffroad.com saulttrussel@xplornet.com