No, definitely not
Most of the mountain bikers coming down these trails are bleeding from somewhere and look like they just lost a fight. I would say electric carts are a negative. Cedar Beach or the Little Lehigh would be much better.
There is a flatter gravel trail that connects to the conservancy, but you need to park at Homestead Park, Kline's Lane, Emmaus. You couldn't use an E-cart on the mountain trails.
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