Not to get into the tube or not debate, but if you have good, straight, rust free rims, there should be no need for tubes.

I have driven on the interstate at highway speeds without problems.

SWEET
Sergeant At Arms: Old Dominion Stovebolt Society
BUNS?!?!?!Where we're going, we don't need no buns.....
1950 GMC 450
1951 Chevy 1/2-Ton
The GreenMachine
In the Stovebolt Gallery