Best place to jack the car is on the axle. You can raise the tire off the ground easily that way. To remove the tire you take the four nuts off that are near the rim. You then have to rock the tire/rim in and out to bring it out opposite the valve stem and then lift the tire/rim off.
There is a video on the website on how to change a split rim tire. It is in the Tech Info under Manuals & Other Docs. It's at the bottom "How to change a Split Rim Tire".
Where Are You From? Grand Junction CO
Do You own a car built by Durant? Too many - Star, Durant & Flint