Hmmm, my new-to-me 2012 19' has the same 180kg tongue load statement on the closet sticker. I weighed my tongue and got 525 lb with half a tank of fresh water (behind the axles) and practically empty gray & black tanks (in front of axles).If you want to get picky…there may be a tongue weight limit printed on the trailer info sticker in the closet as there is on my 2018 - 19. I am at that limit.
I'm not sure I could achieve the 400 lb target even with an empty trailer!

I really haven't added much weight up front. Some leveling blocks and two water hoses in the box, the front cupboards contain towels and other lightweight stuff, and I have maybe 20 lbs of wood pellets under one dinette seat. Outdoor grills, charcoal, 1 lb LP tanks, detachable power cable, and 75' of extension cords are all under the rear bed.
I suppose my Sherline could be inaccurate (reading higher than actual).
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