I'll try to remember to measure my tractor tomorrow and let you know what the length is with the loader attached. The main concern on that size trailer would be where the center of your load winds up being; too far to the rear, not good; too far to the front, not good either. Most dump trailers that size are at least 10,000lb trailers (I've seen 12'ers up to 14,000lbs) which is more than adeqate for your tractor which should be just under 5000lbs with filled tires.
You may want to pick up a Valley Trader magazine, there are usually trailer dealers advertisements in it. One way to get the weight center to balance out a bit is to play around with how you put the machine in the trailer i.e. backed in, vs. pulled in, bucket up & off the front or rear a little (provided the trailer has added side/front height to get everything above your pick-up, provided thats what you'll be using to tow the trailer) etc. I would try to find a way to allow the loader to rest on the trailer (extended) rails if that is the route you choose, just remember to check that everything clears the tow vehicle when making turns.
Also, if you must have the loader outside of the actual trailer, make sure you take the steps to make the loader "not quick attach capeable", there is instructions on how to do this in the owners manual; it's pretty easy to do. Enjoy the new machine.
