We have a 9510 which is the same machine,and in 40-50bu beans with a 25 foot we go about 2.5- 3.2 mph depends on green stems or not. The 6 row 30 inch head we go 4.5- 5.5mph in 150-170 bu corn. in eastern SD. I think you would be able run the 30 foot. That or go with a 9560sts or 9650sts or conventional.