What would be interesting is a sturdy tractor that can be peddled around to move reasonably heavy objects around the yard.
Depending on the functionality you could have the tool ran by a hand-crank or attached to the foot-crank that moves the tractor (with the ability to disengage it).
With foot-crank engagement you could add attachments that mowed/clipped the grass around the bike, or a tiller that would dig into and till the ground.
With hand-crank engagement you could have a plow or scoop that could move stuff like a small amount of dirt or snow.
Without any tool engagement it should be powerful enough to lug trailers full of dirt or wood at a reasonable speed.
Depending on load tolerances I don't see the tools doing too much without some hydraulic assistance but I could be underestimating creative engineering.
Since it'd be designed for heavy duty work the weight of the bike would actually be beneficial to a certain point in order to make sure the tools don't just push the bike around instead of doing what they are supposed to do. (although strategically placing the weight is always optimal)
Depending on the functionality you could have the tool ran by a hand-crank or attached to the foot-crank that moves the tractor (with the ability to disengage it).
With foot-crank engagement you could add attachments that mowed/clipped the grass around the bike, or a tiller that would dig into and till the ground.
With hand-crank engagement you could have a plow or scoop that could move stuff like a small amount of dirt or snow.
Without any tool engagement it should be powerful enough to lug trailers full of dirt or wood at a reasonable speed.
Depending on load tolerances I don't see the tools doing too much without some hydraulic assistance but I could be underestimating creative engineering.
Since it'd be designed for heavy duty work the weight of the bike would actually be beneficial to a certain point in order to make sure the tools don't just push the bike around instead of doing what they are supposed to do. (although strategically placing the weight is always optimal)