Ahhh that explains it.

These wheels without tires can go UPS Ground - does not need to be freight. UPS Ground can handle package shipments up to 150 pounds according to
www.ups.com
I just priced the shipping online. Since the off road wheels are ~26 pounds each, I put the 18 SEs at 32lbs to be safe. Not sure what they really are. Total shipment weight is 128 lbs, and transit time is only 2 days.
Here is the quote:
Ship From: SENOIA, 30276, UNITED STATES
Ship To: WILLIAMSTOWN, 08094, UNITED STATES
Shipment Date: Monday, December 11, 2006
Total Shipment Weight: 128 lbs.
Shipment Declared Value: 200.00
Daily Pickup: No
Drop-off / Pickup: I will pay shipping charges and ship my package at a retail location such as The UPS Store® or UPS Customer Center.
Address Type: Residential
Number of Packages: 4
Arrival Date: End of Day Wednesday, December 13, 2006
Total charges: $83.44