Yes
I would guess that the FEL suggestion is for weight to counter-balance the heavier weight of the MX6 (as opposed to the lighter weight rotary cutters-613). If heavy brush is what you are going to "rotary cut" thus the reason for wanting the heavier MX6, then what I do is leave the loader on just to push over some of the brush ahead of the tractor. It feeds under the tractor better than if pushing brush over with the 4310 front and front axle only. Otherwise, if you don't like the FEL on, then just get the weights to hang on the front end weight bar.
Your dealer is just trying to help you, IMO. He isn't gaining anything by saying you should run it with the FEL on, other than saying you will need something for counter-balancing weight up there. Or the dealer doesn't want you to run out there with big ideas about using the MX6 and then come whimping back to him saying it doesn't work, and he ends up with a used MX6 on his hands. That does happen with green-horns, I am told, and it is expensive for the dealer.
You can find out on your own as well. Just be fore-warned that the front end will be light. But then, maybe doing wheelies is your thing. Keep the individual brakes unlocked so you can steer the rig. Or keep the rotary cutter on the ground, which will allow you to steer with the front wheels. Kinda all what you prefer to do. /w3tcompact/icons/smile.gif
/w3tcompact/icons/grin.gif