I don't know the exact reason it is bumpy, but here is a solution. Try to find a rubber spring to replace the shock at the end of the leaf springs. There is one in the Truckin magazine, this will also improve your stability.
It will depend on which rims will fit your car. Having 16 or 17 inch rims will have a significant jump in the price of your tires.
Most of the time, yes. try it and find out.
Yes, if the bolt pattern and offsets are the same.
No
Depends on if the rim will fit over the brakes.
Wood 28 inch rims and tires fit on a Lincoln town car not the navigator.
Yes you can but it involves shaping the arches of the car around the 24 inch rims.
In some cases yes. depending on the size of caliper and rotor that the car has.
To replace all the tires on a car with 27-inch rims, you would need four tires.
why would you spend more on rims then the car
The price of 24 inch rims for your car depends on where you live. Keep in mind that cheap rims are not of high quality. Cheap rims prices start from 250 dollars.
One can purchase 15 inch rims for a car from online stores such as the website Canadian Tire and the bidding website eBay. Alternatively you may purchase car rims from a catalog store like Argos in the United Kingdom.