60" length is not a problem to ship, but 12’ is oversize and a bit difficult to acquire. It becomes an LTL shipment. Usually with oversize stuff it’s really important to order everything at once because the oversize shipping premium is a big add-on per shipment
I think you can get the oversize stuff shipped to an 8020 distributor easier, and then drive up there and pick it up. But the distributors in Texas are not nearby- Plano, Allen, Addison. There’s likely still a shipping fee to get it to the distributor. Give them a call.
T-slot is specified by the outer dimensions, but confusingly can be metric or inch. 1515 inch=1.5"x1.5", 4080 (metric)=40mmx80mm. So, always pay attention to whether it’s metric or inch system.
The mfg name “80/20” isn’t a size, but easily confused with one. The name actually comes from a saying.
80/20 is not the only mfg of T-slot framing systems. Bosch Rexroth is another mfg.