Another possible ........ a local cement mix company that also sells sand/gravel and landscape rock by the ton has a super nice, outdoor scale that is longer than a semi tractor/dump trailer rig.
I see some local furniture moving rigs going in to check their weight from time to time. No idea if they charge, but if one in your neighborhood, a simple call/question will provide an answer.
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.