Hey folks...gotta keep these things in context...
Im one who says keep the tongue level or pointing slightly down....but know this only new aspect of these new trailer systems. More detail will have eyeballs roll...
Most are out of context...meaning this a SYSTEM comprised of many components...that are ALL interrelated
One example is where the trailer axle symmetrical centerline is in reference to it’s coupler ball center line
Just weighing the tongue in reference to level will have way different values when the axle centerline from trailer to trailer is different
Toss in trailer CG and just this ONE aspect also changes
Last time gmw posted info on his trailers, IIRC, his are more of traditional architecture. Meaning the axle assembly center line is much farther rearward than more modern trailers that,IMHO, have more teeter-tootered weight centered than older, traditional
There is a caster like to these different architecture of where the trailer axle centerline is vs coupler ball centerline
Yet another...there is no one size fits all...but level or pointing slightly down has solved most all trailers I’ve helped solve...hands on and via Internet advice