bicycle uphill in your living room

So we finally got all of our eggs together and managed to cycle in. I bought a Trail-gator and have hooked up my son's bicycle to my own. It is about 2.5km's to my son's school where I then disconnect my son's bike and lock it there, and then another 2.5km's from there to where I work. He is quite stable on it and really enjoys riding. He just turned six and we haven't had the time to teach him how to ride a bike, so this is the way we'll do it until school is out in June. Sometime this summer we'll teach him how to ride on his own, and then I won't pull him any more, we will ride together but separately, so that in the fall when school starts again he will go without using the Trail-gator.