any good advice about towing a car

Because you are new to this, it would be a really good idea to stop at the first rest area you come to or about 50 to 100 miles from your first starting point and check the tie down straps just to be sure that they haven't loosened up on you.

Thank you to everyone for your responses. Very very helpful. I understand that there are numerous rest areas on the way to Florida from Ontario. Can a RV 40' towing a car stay overnight at the rest areas?

Don't ever get in a hurry hooking or unhooking your vehicle be methodical! You can't control what other people are doing so drive the speed your comfortable at and leave your self plenty of room for maneuvering.

Completely agree with the suggestion for practice. The only way to get used to towing is to tow! Your car should follow directly behind your RV, so turns should be fine. I'm guessing you take your turns with your rv a little wider than with a car anyway. Always understand that you are now much longer than before. Don't ever assume someone will move over for you or give you room just because you need them to. Always signal your intentions and remember to be able to see any vehicle you pass well behind where you think they need to be before you go back into a right hand or left hand lane. Just be patient, let other drivers know where you need to go, and you'll be fine. We tow '4 down" (don't use a dolly) so we cannot back up when toad is attached. Wouldn't advise it even with a dolly. When pulling into a parking lot or gas station, be certain you have a direct path out because turning around in a limited space can be torture - if not down right impossible. We almost always use truck stops (Pilot, Flying J, Loves, etc) when we have our toad. They are built for RV's and maneuvering around is not a problem. You acceleration time will be greatly increased when you tow - you can't just 'hit it' and expect to move faster right away. Practice is the only real way you can get the right 'feel' for how your rig will handle/react with a toad. Enjoy, and be safe.

Lane changes, just watch your mirrors and leave plenty of room.

Small towns, not really a problem unless you're trying to find a place to park the rig.

Going slow, not much you can do about it. If you're really holding up traffic try to pull over and let them pass or let them deal with it. If you're doing the minimum speed then you're not doing anything wrong.

Traffic from on ramp. If you're in a bigger city with lot's of traffic, get out of the right lane. Hopefully it's at least 3 lanes so stay in the center lane. If not you may be doing some panic braking because a lot people make very little effort when merging, they expect you to make room. I watch the ramps when coming up to them, if I see traffic coming on I get over. Like I said, bigger cities with lot's off ramps, get out of the right lane.

Know what you're getting into. Don't pull into a place unless you know you can get out. You can't back up more than a few feet when towing a car. Maybe a little more if everything is perfectly straight in line. I pass up a lot of gas stations because I know or think I might have a problem getting out.

Aside from backing up it's pretty much the same as driving the motor home without the car. Even when not towing I'm careful about where I pull into. I leave more room when changing lanes when towing but everything else stays pretty much the same.

Make yourself a reminder sheet of what steps to do in what order.

Hook up the tow dolly, load the car and make several trips in your local area. Don't make the trip to Florida your first towing experience.

Take it out and practice on all types of roads and traffic conditions.
Practice loading/unloading the car and tightening the hold down straps.

If you know someone with a dolly, ask them to go with you on your trial run. They can give you some pointers.
The best way to learn is doing it.

Enjoy your snowbirding.