Another way I have heard to get the tongue weight is to load the tow dolly and put some kind of cone/support under the hitch point and simply put a scale under that. I don't have a tow dolly but based on a couple posts I have seen here and other places, if it is less than #250 then a bathroom scale should do the trick. At least it will be close enough to determine if you need to go to a bigger scale. BTW...I would suspect that the support under the hitch attachment point should raise the dolly connection arm up the the same level as the hitch attachment point.
I could really be that simple...I think. LOL
Don, Sandee & GSD Zeus. Gardian Wings earned are GSDs Gunny (7/11/15) & Thor (5/5/15)
2006 DSDP 4320, Spartan MM IFS, 2013 CR-V, Blue Ox Avail, SMI AF1, Samsung 197R Refer.