If you and your dog are comfortable with the arrangement, there should be very little argument here. It's excellent exercise for both of you.
My gramma had one of those three-wheeled contraptions that was a bike on the back and a cart on the front. She would leash her three bitches to the front of it and let them pull her around the little town she lived in at the time. If one or all of the dogs got tired she would load them into the cart and pedal home. Everybody was happy with the arrangement and you could hear the neighbors saying, "Here comes Peggy and her girls!"