Everything Teebin, Everything. It may seem odd, but the colors, shape, noises, movements, of the ride vehicle help make the ride IMO.
Aaaah. That is a tall order! One thing I wonder about is will it have combustion engine sound effects even though it has none? Theoretically, it should sound like a modern diesel pickup truck - an F350. At least that is what I imagine a 1930's truck would sound like.