"Float" the mower deck on a C?

I have a C with a 5' Sunmastr mower deck under it.  From what I gather, this deck mounts about the same as a Woods deck, a bar bolted to the deck in two places goes back to the finals on each side.  A shoulder bolt or bolt thru a bushing allows the deck to move up and down on an arc.  I mow a field around my shop that used to be a hayfield, at one time it was plowed and then disked but they did a poor job of leveling it and it has hump or really waves in it.  My deck originally came as a skid deck with no wheels, so I made a set of wheels for the front and took the skids off.  The problem is the deck can only move up and down in an arc around the arms off the finals, it cannot really "float" and follow the ground contours.  When the rear wheels are on the hump, the deck is in the valley and the front deck wheels are on the next hump, so the valleys don't really get mowed well and the humps get kind of scalped a bit.  So I was thinking if I take the rearmost bolt out of the arm that is bolted to the deck, it could move up and down and also "rock" front to back.  If I put wheels on the rear outside corners of the deck, and rollers on the back of the deck like on my Wheel Horse mower, I am thinking it would follow the ground contours pretty well.  My neighbor thinks the main drive belt would pop off when it dropped down too far, so I was thinking I could limit the vertical travel (if necessary) with a piece of chain.  The hyd lift should still work.