HRJA is a nice group of people
EJP(eriejeeppeople) is alright, but I may be a little biased on that!
http://www.pghoffroad.com A local group for me anyhow.
http://www.northeastcrawlers.com
NEC is more my hangout(can ya tell?!?!), but I don't know how KJ friendly they would be, No offense, they're just a more experienced group with certain guidelines for the actual club. They run a lot of more modified trails that need clearance, lockers, etc. And are mainly cjs,yjs,xjs,tj's etc. But are a friendly bunch, just a litle blunt at times

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'03 TJ X with 32's and other doodads
'04 Columbia Edition KJ
'78 GMC K25 beast
'06 Yamaha 450 kodiak