Hey, I hadn't thought of that! Certainly, the Amish would find a use for a "retired" pacer or trotter, and would get decent treatment for work delivered. Actually, that's a cheerful thought. So much of racing, behind the glamour the crowd sees, is depressing and sordid.
Being that they're the "plain folk", it's almost gloriously contradictory to see some flashy sorrel or glossy dapple gray stepping out in style, hauling his black-clad 'family' in their black-on-black carriages.
The horses really clip along in traffic with their ground-eating strides and you can see the pride in their eyes and the arch of their necks.
The kids hang all over them, petting them and giving them treats.
I've seen quite a few Thoroughbreds pulling too but they do tend to favor the gaited horses.
FWIW, I take my dogs exclusively to Mennonite vets in Greencastle PA.
They get treatment there like they've never gotten anywhere else.