Do you tow or do you rent one when you get there???

I tow either the truck (four down) or the PT Cruiser (on a dolly) or a trailer with an ATV on it, depending on where we are going.
Many times, there is no car rental agency available where we are going, so renting is not a viable option.
I would rather have my own vehicle.

"If your young, or at least flexible, there is nothing wrong with a tow-dolly."
HMMMM... Apparently, once again I am an anomaly. I am 73, arthritic, overweight, and have COPD. My tow dolly and I get along just fine.

Your profile does not give a whole lot of background. We used a tow-dolly with great success for 25+ years. Finally gave it up when the knees and back complained more than I wanted to hear. We now tow 4 down. Our previous RVs had a 454 gas engine, then a Ford V 10, then the Workhorse 8.1, now a diesel. Never noticed any change in driving towing a light car over the California mountains. MPG seemed to stay between 6 and 8, never more than 8mpg and usually closer to 6...lots of mountains. We have rented a car on occasion when towing seemed inappropriate for the destination. Renting, though easy, is still a bit of a hassle, especially if it is for a short period. Wait for the pickup, drive to the office, wait for the clerk to finish the current customer, then fill the paperwork, and finally arrange for return. There are exceptions. In West Yellowstone, Big Sky had the car waiting for us at the KOA, and we left the keys with the KOA office when we left. Same was true at Circle of Pines KOA in Williams AZ, using Route 66 Rentals. Our Avis club card has all the paperwork prepared in advance, but unless it is an airport pickup you still have to wait for a driver to fetch you. Then there is always insurance. If you scratch or dent your car you can cry, moan, scream, and get all sorts of angry. If you dent the rental you will have to pay the deductible, pay lose of use on the vehicle, and make the insurance claim, unless you cough up the $10 to $20 dollars a day for full coverage insurance.
If your young, or at least flexible, there is nothing wrong with a tow-dolly.
JMHO and Happy Trails.
PS: We're taking a long weekend to visit friends this weekend and I will be renting a car at the destination.

I rented when we first started, and it worked, until we started visiting places off the beaten path. The western and eastern Sierra's are vast and we found ourselves having to reserve a rental and pick it up, and the DW would follow me in it, sometimes hours from our destination because there was no other place to grab a rental. After that happened a few times, I set up my old TV, 4 down, and we now bring it with us.
Now that I have one that can be towed 4 down, I will always tow 4 down and pass up the rental due to the convenience. If I had to dolly it, I would probably prefer the dolly over the rental, it is just easier when you already have it to go when and where you need to.

We tow our CRV behind the MH using the Ready Brute Elite towbar & braking system. You can rent roughly ten times for the cost of buying/installing the towing system. The convenience of having your car with you was well worth the cost to us. This summer we used the MH to take us (and our CRV) to a distant state where we camped at a State Park, that evening used the car to drive into the City to attend an orchestra concert, then drove back to the MH in the park. That would have been tough to do any other way.

Also, knock on wood, should anything happen to the MH, then we have another vehicle with us.

Once the car is equipped for towing, hookup is fast and easy. I prefer 4-wheel-down towing to the use of a dolly for reasons mentioned earlier.

Our MH has plenty of power - I do not noticed that we're towing - even on hills in the mountains. No difference in MPG either.

I rented...once. Bring your own car and you'll be a lot happier. Dollies are a pain to use, but the beauty is that you buy once and can tow almost any FWD car. I have a dolly now and plan to keep using it.

In short, I'm not going to talk you out of it :)

We've towed on a dolly and now 4 down. Both ways have pros and cons. Only issue we ever had with the dolly was where to put it when we didn't have a long pull-thru. No noticeable mileage drop here either.

I tow on a dolly, I like having my car when I get to a destination. I really don't see any drop in gas mileage. It seems that I get around 8.5 MPG whether towing or not.

Sometimes I am in a place where you would not be able to rent a car. I would be stuck with no transportation, no thanks I'll tow. JMO

I do a lot of running around so I tow 4 on the ground.

We do not toad when we go to Arizona in the winter. We are in a very convenient Geezer park with all necessary shopping within a mile. We rent from Enterprise on the weekend where we get a car for $9.99 a day. We rent from Friday AM to Monday AM for $32.04 all in. They pick us up and drop us off.
Guess it depends on where you stay long term. I prefer the exercise and not having the toad makes us partake of the resorts activities more than if we had a car.