[hemiguy]

I have to admit I did not read this whole (long) thread, but will add my 2 cents. Just my opinion, but I personally think you are going way overkill on this trailer thing. I really don't think you need a 10k trailer and certainly not A WD hitch. Those guys with 5000 to 7000 lb tractors need a 10K and a 3/4t or 1 ton tow vehicle too. But you have a subcompact kubota, not a JD3520, MF 1540, or NH TC45D

I have a JD2520 TLB that weighs 4000lbs and it rides just fine on my 16', 7k, wood deck Topbrand trailer that cost $2200 new. It has 4 wheel brakes, weighs about 2k empty and I tow with a 1/2 ton Dodge PU with factory tow package. I could use another 2' in the length department but otherwise, no issues at all. This all seems pretty comparable to what you are trying to do. Most of what you "feel" when towing your tractor is really going to depend more on how you have the load positioned over the axles and how your brake controller is adjusted than what type of trailer you have.

If you plan on upgrading your equipment and/or tow vehicle soon then go ahead and spend more money, but I really don't think you need to. And by the way most 10k trailers are really 9990lb since 10k and up you technically need a CDL. And yes you can get a ticket if your trailer GVW rating exceeds your tow vehicle rating.

Again, just my opinions. Good luck .