We have a Fast 8116 1600 gallon 15 coulter unit with raven controls and hyd pump, and love the setup.  Have used other model fasts, dmi, and progressive with a ground pump and like the hyd pump setup a lot better.  Far more accurate and don't have to go find the chain when it flys off the applicator.  A 4455 would pull this easy in the flat and would ride nicer with duals in the hills.  Pulled our with an 8100 mfwd and 4450 Mfwd some with no problems.  Neigbor rented it and had it on a 90 horse CaseIH tractor, didn't fill the tank full but it worked.

This is what ours looks like.

http://www.tractorhouse.com/listingsdetail/detail.aspx?OHID=7916015