I have a L3010HST. I would like to get a tiller for it. My question is would a 6’ tiller be better or a 7’? My rear tires are 66” wide outside to outside so to cover that I would need a 7’ but everything I have read a 7’ tiller requires 30 PTO horsepower and my machine is rated for 25 PTO horsepower which would make the 6’ tiller be the best but then I’m not covering my tires.