I have an inexpensive Nesco. I dried my first peaches last week. They taste great.
I got about six slices per peach. I dipped the peach slices in a solution of fresh squeezed lemon in about a pint of water, and then spread them on the rack skin side down. I turned them a couple of times and rotated the racks a couple of times. If I has a better dehydrator (Excalibur), I probably would not need to do that.
Next time I might skin them to speed up the drying.
Give it a shot.
The skins are where all of the vitamins and minerals are ... I leave them on. It is really a matter of personal preference though.