How about any of the truck stops with CAT scales.  They weigh axle by axle
(then divide by 2?)

After a long hunt I found a place near my home. This might work for you.
Find a Highway Weigh Scales that are closed but leave the electronic weight
display on. If there are no cement curbs on each side of the scales you can
weigh:
Front axle then rear axle.
Back up, move over so only one wheel at a time will be on the Scales when
you pull ahead again.
Subtract each wheel weight from the appropriate axle weight.
I hope this makes sense.

Good Luck,
Ray in Ontario