Commercial Aluminum Get to work with an A.R.E. commercial aluminum cap. Our rugged welded frame construction offers years of durable service, no matter what the weather or job. Choose between our DCU ® (.035 aluminum skin), DCU MAX ™ (.063 aluminum skin) or our Diamond Edition DCU ™ (.063 diamond plate aluminum skin) to outfit your truck. Each of our commercial aluminum models has weather-sealed doors with gas props, heavy-duty hinges, and BOLT One-Key technology locks to protect your valuables.