You'll need a pick-up truck, and some money, but a relatively cheap way to end all the work is to buy a heavier four wheel cart (like from TSC or a garden center, preferably with a plastic cargo tray) then some schedule 10 PVC (six inch, with four end caps) cut the PVC to about four foot and glue and cap the ends for your pontoons. Bungee these to the cart, and wala, you can put all of your gear in it for the trip out or back, tie a rope to it and install a pole for your dive flag and it's your surface marker (it really towes very easy) If you really want to be lazy (like me) you can add some styrofoam layers between the tray and chasis,(for more boyouncy) a car battery (which is on a dual system in my truck) and.......... a min kota motor! Now when your done and half mile offshore getting back is easy. People do tend to stare, but I'm pretty ugly so I like the attention
Do you have a picture? My wagon (a heavy-duty garden cart) is pretty heavy, so I'm not sure if the PVC pipes will provide enough lift.. but they might.. hmm... 
