OP,
In my case, my cabbed tractor weighs 4200 lbs (that's bare chassis weight) dry weight (according to manufacturer listed weight). The FEL with standard bucket weighs 1200 lbs. When I bought mine, I had the dealer fill the rear tires with Rimgaurd. At the first opportunity I brought it to the CAT scale and weighed it. According to the actual scale, my tractor with FEL + bucket, filled rear tires, and a box blade (it's what I had on at the time) weighs 7100 lbs. Rimguard is the heaviest liquid you can fill your tires with, but it's not available in all areas. My tires are size 420/70x24, and they are filled up to the top of the rim on the high side, to give you an idea of how much weight to add for filling rear tires.
I have been hauling this on my 18' car trailer. It's been "working", but the load is too heavy for my rated trailer capacity. My next trailer will be a +/- 30' deckover gooseneck. The reason I want such a big jump in trailer deck length is there have been several times I've wished to have more that one set of attachments with me while on a job site. With an 18' trailer, it's not an option because there is no room to put anything else on. You get what's on the tractor and that's it. I also want the deckover for hauling pallets or IBC totes more easily that a standard deck with wheel wells in the way.
This is my 18' trailer with my 6' mower on the back:
View attachment 712484
As you can see, it hangs off the back by several feet. A 22' deck would keep it all on the deck with no overhang. But I want room for a couple of attachments as well.
With the box blade on the 3pt, it doesn't overhang at all:
View attachment 712495