Hey Paul, I don't know if your guy can get firestone but we just put a set of inexpensive tires on Pam's rig that I have used before in winter and summer and I really liked them, especially on snow.
They are called firestone winterforce.
265/70-17 were about $110 US each mounted & balanced.
Little on the soft side, probably a 30k mile tire but for that price, hell who cares.
