Have you looked outside the box? A google search shows a lot of sand, gravel and concrete suppliers that typically have scales. Also, moving companies regularly use scales and if they don't have a scale may be able to direct you toward scales. Another group of firms that have scales are farm stores supplying fertilizer and lime and farm chemicals. Also look for elevators where farms sell grain and corn. They're out there, they just tend to hide below the horizon a bit. A call to your state police may also locate a weigh scale location, either permanent or temporary, that may help, especially if you whine a bit. (LOL)
Although individual corner weights are the most desirable, weights by the axle are satisfactory until you can get the 4 corners weighed. If you're concerned about side to side weights you can do an axle weight and add 5psi to account for that concern.
2013 Tiffin Allegro Bus 43QGP
2011 Chevy Silverado 1500 Toad