I have had a 7510 for 5 years now. Most of my implements are only 4' wide. I kept them to 4' for maneuverability. Last year I purchased probably the most useful tool other than the FEL. That being a 5' wide Armstrong Ag Land Plane.
Everything Attachments has them pictured on their web site as well as a video of one in use. If you want your finished project to be level use a land plane. If you want to move dirt from one place to another use a box blade or FEL if you have one.
Tractor Land Plane - Tractor Land Leveler - 3 point Hitch