Baseball cards are nice, but they can't haul my camper. Neither can my Frontier now (RIP).
1928 Tharp's Ice Cream #6 Babe Ruth (Throwing) SGC 1
$7950 shipped/insured.
If you're interested in a dynamic duo, you can add the Tharp's Gehrig #26 SGC 1.5 for a total of $10,150 shipped/insured.
These are priced at cost (with me eating the shipping/insurance), so I'm firm on the price.