Never been on a Pacer myself.
Tis a strange experience, based on a lorry chassis with a single wheel at each corner - I think bend greasers were invented for Pacers as the wheels always face the same direction regardless of where the train is going.
However they don't ride like a lorry or a train or any other mode of transport - more like a horse or a donkey after which they are named - most upsetting to the brain to ride on a flat truck on flat rails only to be pitched forward and back as if on a bucking bronco - the only relief is the uninterrupted panoramic view over the top of low backed bus seats.
First time I used one I was trapped on it as I couldn't find the door open button - it's hidden on the blind side to the passengers.