On the Dan Woods "Milk Truck" he is running a SINGLE coil spring in the middle of the I beam. Here is my question. Does this suspension set up actually work or is it for show only?
Yeah...Danny joked about taking it to the Nats. (driving it) That 'joke' prompted Andy Brizio to be a front runner in the long distance round trip in a hot rod.
Just at a glance, it would appear you would need, at a minimum, a "panhard bar" type device to provide lateral stability to the front axle.
Look at the front-on picture. It does have a panhard bar. It still does not provide a lot of stability side to side "rocking".
An I-beam with hair pins would've acted like a large sway bar. It would have kept it from rolling in turns. If he'd have used a quarter elliptic leaf spring in the middle of the axle instead of the coil, he wouldn't have even needed a panhard bar. The way it's set up now, the truck would act like a large tricycle. I'd still deliver milk in it, though.
The guy to answer this would be Bernie's Welding. He'd be the authority because he has the fiberglass molds to the Milk Truck .