If you can manage the logistics, cache what you need at your overnight stops. I Just did a 200mi, three day trip of the rockies in Canada. we dropped small over night boxes at our hostels on the way to our start point. My overnight box included a tshirt, shorts flip flops, travel size abolutions, and chamois cream in a travel bottle. Effectively, I carried no more for three days than I do for one. If you talk nice to the B&B's you may be able to Post you boxes ahead of your trip.