I bought a used R60 and really like it. When buying used equipment, I look at the condition of the cab upholstery and exterior sheet metal. My philosophy is if the former owner took care of the stuff I can see, he probably took care of the stuff I cant see. I wouldnt add a bin extension to any combine unless the operators manual specifically said it was okay. Thats just me, but I have heard of too many guys who ended up replacing expensive driveline parts and some have had to do frame repair because they overloaded the basic machine. I know lots of others do it but I wouldnt. Good luck with your purchase.