I'm a really big guy (6'5" about 300 pounds), I have been riding for years on mountain bikes, presently a Cannondale Killer V with Marz. Z2 shock and Thudbuster seat post. This bike has done me well for the last 5 years but my riding has changed, I now do mostly road riding (a lot of gravel roads) and some rail trails. I ride a fair bit almost 4000 km this year. I have slicks on the CDale. Which brings me to my question, I would like to get into some long tours maybe across Canada (using a BOB trailer to get the weight off the bike) How much faster, better, more comfortable would a true touring bike be? My son and others are all trying to talk me into getting a road bike. Would a stock road frame be up to my weight, am I looking at custom or should I stay on the Mountain bike. Thanks for the Help. I'm new here this is a great forum.