yes, im almost positive the R4 tires will work for my application, due to them providing a lower and wider stance, and possibly able to hold a little more liquid.
as far as what liquid? i havent looked into that yet, but seems rim guard is the best, however, most expensive..
as a side note, the more i think about which tractor, i lean more and more towards that Grand L 5460!
dang, they are not cheap...but the longer I wait, the more $$ I have for a down payment each week, which helps me rationalize my desire for a grand L...lol...