You can't pull a plow, or a wagon for instance.

And speed will not be a prerequisite BTW.

One can tow several hundred lbs. of payload on a bike trailer, and more on the bike/trike itself.

http://worksmancycles.com/shopsite_sc/store/html/page6.html

Best Hopes for Bicycles & Tricycles,

Alan

Do you know anyone who does this regularly, or even occassionally, for the distances mentioned? I bike to work (and everywhere else, as I don't have a car), an 8 mile roundtrip with significant hills in 15 minutes there, 20-25 back, carrying up to 40-50 pounds when work requires traveling, and I can't imagine towing several hundred pounds up the hills I encounter on my trip would be pleasant, whether trying to brake or pedal. Granted I've never tried towing weight before, but towing that much weight on anything but rather flat ground strikes me as a challenge I would rather dodge. Anyway, just curious if this does happen.

You can pull an amazing amount of weight with a bike trailer. Going uphill is tough, and stopping is too. But, gearing is everything, and as long as you accept very low speeds on the climbs, 1000 lb on a smooth road is very doable with the right gears.

If you ride enough with your trailer, maybe you can make the Olympic cycling team, like Svein Tuft. This is an AMAZING story:

http://www.bcsportsbeat.ca/More/olympian_svein_tuft_story_719.htm

20 years ago in Beijing the streets were full of bicycle "trucks" carrying all sorts of goods around the city. They were slow but it was amazing what they could carry.