An idea would be describe or give us an example of what you want to do. If you have read through the forum much lots of ideas pass through here.
Some of what you may want to do can be reviewed and given recommendations. If you want to move 3 tons of cargo by bicycle, while it can be done it is fairly impractical because of the ultra low gearing required to even get it moving.
So describe what your looking to do. Or attach a link for a commercial version you have seen. Or if worse comes to worse do a stick drawing of what you want to do and let us have a once over. Ed pedalcars has done this and come up with the Inferno trike. No need to be an engineer- just need to ask the right questions.