Did some thinking but did nothng about this. Also becouse I try to use my dog to pull stuff, and for him 4 wheels is better than 2 of course.
The main reason for not building is there is "garden carts" already on the market in all sizes and weight limitations, from childrens toys to the size you could pull behind a small tractor (gras cutter).
I think somebody in this forum posted about doing it.
Weight, tyre preassure width of tyres and type of bearrings are some of the things that would decide on rolling resistance, but for sure it would be heavyer. This is one of many reaons I use a longtail bike instead of a trailer most of the time. Also, with most of or all the weight on the bike you do not get the problems you describe
Not important really, since this is somethimg most peopel would not use as a only trailer. I am sure for some purposes it could be great, especially if you already own one.
Last edited by badmother; 09-06-08 at 12:25 PM.