Trafalgar isn’t too far. What general part of Indy are you in. If I come help you look at it, I do have a truck (well more than one) and a trailer. We could get it loaded and moved to your house. The Roper may be interesting also. I know of a couple people that had them and really liked time. Can you post pics of them?
if it hasn’t ran in 20+ years, I would first see if the engine is loose and will turn by hand. To do this, you will need to remove the side panels and reach in and turn the driveshaft. If it is free, it would more than likely need a carb rebuild, which isn’t expensive or hard to do. It will need a bat-tree after sitting this long. That is located under the seat. Maybe put some wind in the tires if they are flat, it would be much easier to move. The Quietlines had both manual and automatic valves. Manual would have a lever on the tunnel cover ”under” your right thigh when sitting on the seat. But sitting this long, it wouldn’t surprise mi it it would roll with either. The Hy-Tran would have bled down by now.
Once you check these, and it is loose, then throw a battery in it and see if it will crank. There could be a safety switch or three that are dirty and need to be exercised and let it turn over. If it will crank, sitting that long, I would change the oil before trying to do much more than see if it will spin, who knows what could be in it after all this time. This oil change, I would not worry about a specific oil, just something cheap, and maybe something you have on hand. Motor oil that is clean and oil is the goal here. Just something clean to have in it while troubleshooting and attempting to start it and run it. If it runs and doesn’t need the engine torn down, then the oil should be changed to something more appropriate. ISO mount condition can be checked, and just a good once over.... Sitting inside and protected from the elements gives you a bit of a leg up.
We all here can help walk you through working on this machine. My offer still stands, if you would like, I can come look at it with you... Sometimes someone that has experience with these can spot things, or help figure things out.