We have been asking Waze to add quantitative restrictions to the app for many years: width, height, weight etc. Waze HQ's responses has been consistent for all this time - they have no intention to do so.
There are also several vehicle-types for which restrictions can be set in the app such as truck, bus, towing vehicle, hazardous materials - and RV. These vehicle types are have no meaningful/precise definition and are, in consequence, useless. Not to mention the fact that the app doesn't support them and Waze HQ have, once again, said there is no intention for it to do so.
I'm sorry, but if you use Waze with any vehicle that is physically different from a "normal passenger car" or motorcycle, then you have to use it whilst being aware that it may produce routes you cannot use.