I don't own a rolling pin. I have tried smooshing it, and haven't gotten it thin enough. Though i am sure I could push harder. I just fill a sink with hot water when I do this. I don't find it that bad to wash. Though this does sound good.
Also what I do, is just run the dehydrator for days. Venison doesn't drip fat. So I do one batch after another, Washing the dehydrator trays is the biggest PIA.