It is always best to run two man crews. When you get moving, even the best detailer can overlook something and having another man there almost guarantees perfection. It's also a good idea in case someone falls ill. Let's face it, we come in contact with some nasty stuff on a daily basis. Depending on who you have working for you, there can be some sick days involved. My advice to you is to stick with the 2 man crews in order to boost company credibility and quality. I have done it both ways amd I always come back to a 2 man crew. It cuta your commission down but 75% of something is better than 100% of nothing. Been doing this for close to twelve years now so I have some experience on the matter. My 2 Cents.