Redefining beds

I am putting a bid together for an acarage property and all of the beds and trees need to be redone. The linear measurement comes out to 500’ feet. I just came across The BRD-2620 Echo Bed Redefine I'm thinking about getting the whole unit or just the attachment for my PAS

What formula does everyone use?

Do you list the price on the invoice

What equipment works best?