'Hands on a Hardbody,' a seemingly far-fetched stage show based on a documentary that features songs co-written by Phish frontman Trey Anastasio, stars a modified Aztec red Nissan. By the end of the show, you'll swear that truck can dance. You might, too. Anastasio and Broadway veteran Amanda Green have written a soundtrack of mostly fine songs in a nice mix of styles - blues, gospel, country and honky-tonk - that will fire you right up. Playwright Doug Wright has had some fun himself, the cast is committed and realistic, and the whole thing is a pleasing, tuneful, heart-filled ode to small towns and American dreams.