Just a few thoughts......
First, the tongue weight. The suggestions here are excellent ones to start with as far as positioning the machine on the trailer. But, there is some tweaking to be done. Once you find the place to put the machine as outlined here, go for a ride. You'll only have to go about a 1/2 mile to feel the tongue weight. I know its a pain, but then loosen the chains, and try 6-8" forward, and go for another ride. Then try 6-8" behind where you started. Doing this will get you right where you want to be. You'll be surprised at how much difference a few inches of machine placement will make.
Next, chains/binders. Make sure you get chain rating at the right working strength . The Federal Motor Carrier Laws say that the chain/binder working strength must equal at least 1/2 the weight of the tied down unit. Example: 10,000 machine needs 5000lbs of working weight tie downs. For a machine this size you need two sets (one front, one rear). So make sure your chains and binders are at least this strength. Also, get ratchet binders. Don't even bother with the lever type binders.
And, when you are all secured down, and on your trip, find a nice place to pull over in about 20-30 minutes to check your chains. Anything with rubber tires will loosen up a little. With the ratchet binders, all it takes is a stroke or two to re-tighten.
Most of all, enjoy your trip. It's refreshing to see someone do the research before embarking on a mission like this.