Originally Posted by perfpix
Still doesn't state the actual loaded tongue weight, which I also would like to know.
Actual loaded tongue weight will depend on what you put in the trailer and where you put it. You can't change where you put the water as the tanks are fixed, but everything else can be moved around to get the tongue weight you want (especially with the X213's bunk bed storage area up front).
In the 2011 Trailer Life article, a X213 with just water, propane and (I assume battery) had a tongue weight of 12% (560 lbs). No cargo.
If you put all your cargo up front, then tongue weight will increase. If you put everything in back, tongue weight will decrease. You want to have a minimum of 10% tongue weight. More tongue weight will increase trailer stability. Less tongue weight will make it more likely to sway and behave poorly.
The X213 has a really, really light "brochure" tongue weight of 330 lbs. This is probably because without propane, battery, spare tire and other stuff on the front of the A-frame, the huge rear slide-out makes the trailer tail heavy. Putting all the real-world stuff on the trailer will give a more realistic and stable-towing tongue weight.
Do not figure a tongue weight less than 10% of the total trailer weight unless your tow vehicle massively outweighs the trailer, has a long wheel base, short tow-vehicle rear-axle to hitch distance and you drive slowly in non-windy conditions. It will sway. The more weight over 10%, the more safety margin you'll have in regards to sway.