It will affect your steering. N's with loaders are pretty much powered wheelbarrows. They can scoop uncompacted materials, and maneuer, snow, etc. They are not a digging machine.
As I said before.. steering will be tougher. I suggest you get/make a counterweight for the rear end. Most people just get a big plastic tub or barell, and cut a hole in either side and slide a drawbar thru it, seal the holes with duct tape, and then fill it with concrete, Add a method to hook up the toplink. 400-600 pounds helps alot. Also.. you may find that the skinny 4x19 tires either flatten out under a heavy load, or leave 3" deep ruts whereever you drive. 2 easy fixes, and quite a few more involved ones.
You could get a set of flat or knobby motorcycle tires for the front.. they mount up fine, and you can get them a tad wider/flatter than an oem 3-rib. Second option is to order a new rim.. like a 16" rim, and then you have a wide variety of ag and implement tires that will fit on it. Be carefull. Most implement rims have a small bolt pattern that is the same as the 8n front hub. The 9n/2n has a wide hub, however places like
www.just8ns.com DO carry a 16" rim for the 9n/2n.
Other options are to swap out your front hubs with 8n hubs..
Here's a pic of the counterweight I made for my 660 with 1 arm loader.
Soundguy