I currently tow my kid in his Burley using a MTB. Looking into buying a nice, old school road bike to do the same. However, the bike is on 27" wheels and has a standard double crank (don't know anything about the cassette if that makes a difference). The town I live in has moderate rolling hills but there are some pretty steep roads too. I have to walk the MTB and trailer the last 1/4 mile uphill to my house as it is a double digit grade so I fully expect to do the same with the road bike. Question is, will I be able to tow at all with it? What's teh diff in gearing between a MTB and road bike on 27" wheels and standard double?