Looking for add-ons to add dimensions to products for shipping calculation w/ USPS

1.5.6

I commonly sell something of 32" long, and I'm getting burned on shipping costs at checkout. (ie USPS priority mail flat rate medium sized box)

Any suggestions? I've skimmed through a lot of threads on this topic, and I know it's a large one. Hoping someone can give me a quick summary of what I'm after.

I'm part of the way into mashing in this but I'm not sure it will influence the shipping quote:

https://www.numinix.com/zen-cart-plugins-modules-shipping-c-179_250_373_163/attribute-dimensions

Note that the mod you are looking at only works with an endicia exporter built by them.

I would search for advanced shipper by ceon.

Much better solution.

What about ceiling functioning the L, W, H?

It's a commercial product is why I was not exact in it's capabilities. We have a customer that ships flags and flag poles to 25'. No problem.