Tongue weight will completely depend on how you load the trailer. Anywhere from negative tongue weight to the full 4,000 lbs.
Moment arm formula ... or simply weigh your tow vehicle with trailer and weigh vehicle without tow trailer to find tongue weight. They also make tongue weight scales.
Love mashing ass, but then again who doesn’t?Or....an easier way is mash the ass and your good to go! Start driving and if she wags a little put more on the tongue. At least thats what we hill billy farmers do!