I have boy twins that just turned 3 and one was potty trained before 2, the other right around 2.5 so it can definitely be done. I had two baby bjorn kiddy potties for the house and one baby bjorn kiddy potty for my car. When we first started, in the AM if they were dry I sat them on the potty. If they successfully peed/pooped i gave them M/M's as a reward. I did the same thing before nap, after nap, before tub, and before bed. Once we were fairly consistent with these things, I switch to underwear and we dealt with about 3 days of accidents before they got what was going on and managed to get to the bathroom. I didn't scold when we had accidents at the beginning, but just told them it was great they peed, but it needed to go in the potty.
Good luck! It was definitely easier to potty train one and then the other. I know that most of my friends with twins all managed to have it happen that way. If you want any other info, send me a message.
BTW: not sure where you are located, but we have a great Mom of Twins Group if you are interested.