Seems like a straight forward yes/no question but to me it's not. "can I" is never the right question. More like "should I". You could tow it and much more but consider steep grades, head wind, braking ability and mechanical wear and tear. Looks to me you would be over the factory capacities with all the weight you would add. I know some don't believe in the 80% rule(tow no more than 80% of the rating") its a good recommendation and allows room for error. Especially if yow want to be safe and keep the truck well over 100,000 miles. But it's your call.