We're building our trailer and are in the process of deciding
where to place the axels so that the tongue weight comes out
to 400 to 500 lbs. Our bathroom scale only goes to 200 lbs
or so. And we can't move the trailer & boat to go use the
truck scales at the local yards. Looking online, scales that
go to 500lbs are $600 or so.

So, any ideas on how we can do this measure and/or where to
find (buy or rent) scales without spending too much $$$?

Thanks,
Gary