Please for the love of god dont mail wheels with air in them, i work at ups and if you are putting our lives at risk.
First elevation change, heat and cold effect. Second i prefer when people ship their tires in no box, easier to grab much easier, also if ypu are sending it as standerd price wont jump up, if you send it as express as in 1 day shipping or even 2 day shipping prices will go way up because the have to go thru x ray scanner and a security check.
Also if you want cheaper prices have the package mailed to a business, price will drop.
Btw if you lie about the weight, and size, we will find out, once a package arrices to a main center they all go thru scanners and get weighed and you will get charged.
ALWAYS TELL UPS WHAT IS IN THE BOX.