Bicycle to tricycle conversion kits I have back and balance problems and am blind in one eye so DMV took my drivers license away. I have been looking at conversion kits to turn a bike into a trike.  

None of the sellers have contacted have been much help on specifics of whether modifications can be made. I live on a very steep dirt road in the desert. I think that I need duel disk brakes on the back wheels and a differential. I will have to ride the brakes all the way for the first 1.5 miles. It is a 1 foot in 10 feet slope.

A recumbent trike will not do because I cannot take any pressure from the rear on my back. Sitting up right is not easy but I can do it. So I need to go slow down hill (dragging my feet is not an option). To go up hill I will need a very low (less than 1 to 1) gear. I mean walking speed low. And I have to do it on a low budget.

Does anyone have experience with the 7 speed bike to trike kits. Can the rear gears be changed. I figure I can put a really small gear on the front crank and a larger one on the back. Does that make sense? I found one manufacturer in Brazil who makes an 7 speed bike to trike adapter for reasonable price but have not gotten any response to my questions. Oh. I already know that I will not be able to make sharp turns at speed.
It might be more practical to invest in a trike that is a trike by design through and through. I am not sure what your budget is like, but this sounds like what you need. It's still a Pedal powered tricycle, but the electric assist will help you up that hill, especially if you are loaded down with groceries, etc. https://www.vitalitymedical.com/ewheels-ew-29-electric-trike-red-bundle.html