You should really think about joining a club. Most clubs have access to private land, know most of the legal wheeling spots and are always looking for more members.
Check out
http://www.berkshire4wheelers.org/
It's our local club... we actually wheel in a spot near palmer every now and then. Check out the site and PM me there if you need any info.
Ryan
(sorry I tried to send this in a PM but the site keeps telling me my PM box is full but there are no PM's in my mailbox)