Quite right he is about camping. My son is a bit older (almost 11 then), and we did a 10 day ride from Aachen to Luxemburg last year - camping. Camping saves money, and is far more fun if you have decent gear. Decent gear for two (tent, mattresses, sleeping bags and stove plus pots) only weighs some 6 kg. On our trip my son had front rollers on the back like your son, and I had front and back panniers. We were still using much of our older bulkier gear that we have since replaced. I am confident we could now do it with just rear panniers for me (tent on top of the rack), plus his front rollers on the back of his bike. Anyway, junior loved it. Sometimes he had to walk the very steep hills, but sometimes he beat me, and benignly enquired if I was coping. Getting lost together, having together made the wrong decision, and then having to deal with another big climb as a consequence, it was all excellent for bonding. More people should do this.
Willem