Been around the Rx2 series since 2003 they have less belts and look simpler to change out than a Deere.   With Gleaners you want to be 1994 or newer that gives you the Cummins and the belt driven clean grain fan.  Somewhere between 1995 and 2001 they modified the tensioners on the feed conveyors we are going to update my 95 to have the newer tensioners.  I’m slowly switching tractors to Deere but as long as Agco doesn’t do something too stupid I’m very content running Gleaners.