They (PADCNR) have increased the weight limit to 1000 lbs. for Class I ATV regulations early last year.
There was a big push in PA for this since the popularity of the Polaris RZR was rising & it was the only
50" side x side available on the market. It's a win - win for everyone, if RZR's are allowed on SF Land.
* PADCNR requires all ATV's be registered ~ $20 per 2 yrs
* A registration requires a title for PA residents
* A title for PA residents requires paying
taxes 
Families can now ride together & the state picks up more money.