I have a 95 trek 1220 still with the stock rsx group set. This bike will be used for unsupported tours with a Bob trailer. I want to replace the rsx with shimano tiagra 4700 or 4703. The difference between the two is the crank. Either a double or triple is available. with a triple my largest cassette option goes up to 32 teeth. With the double the largest is 34 teeth. So on a triple I can get a gear ratio of .94 and with a compact double I can get a lowest gear ratio of 1. For loaded touring in the mountains is having that little bit lower gear going to help that much or should I just stay with the double group set?