If all you're planning to do is drive on and off a trailer at a car show, that PowerGen alternator might be a good choice. Don't count on it to do a good job of keeping the battery charged or lasting a long time in a daily driver situation. The physical shape of a generator-looking alternator is all wrong for doing a good job of battery charging and/or powering high current draw accessories.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!