One of the bays in my garage has an old NEMA 6-20 outlet. The outlet is inches away from the subpanel but the box is already maxed out and it looks like I only have 40 amps total going to the entire garage currently. Is it possible to update the 6-20 to another 240v 20 amp plug that Tesla makes an adaptor for? I did see the 5-20 adaptor but it is only 120v. For the other bays in my garage, I am in the process of getting a new 100 amp service line run which should allow me to install two NEMA 14-50 outlets. I would probably park the future Tesla(s) where they could access the 14-50 outlets but it would be nice if the 240v plug in the third bay could be used as well. Suggestions?