I’ve been looking for the same type of plugin. Like you said, either the plugs I found either caused errors or were completely outdated.
Check out this site: https://www.augustalinenservice.com/rental-products-quote-form/
This is exactly what I am looking for, but it doesn’t appear they used a plug-in, so I am still at a loss as far as what direction to go in. Is this type of quote shopping cart you are looking for as well?
