We were fortunately upgraded at pickup to an intermediate SUV, which was helpful because it meant we had a little more room to work with for our trip for the holidays.
We had a slow leak in a tire. I spent an hour on the phone with roadside service trying to find a way to get the tire fixed, and was recommended a tire shop 25 minutes away. I called two places that were closer to me in the next 2 minutes and found that one of them could see me right away and went there. They checked the tire, determined that it needed replaced, but didn't have the replacement in stock. They filled it so that it could carry me for a while longer. I stopped at an off-airport location to see if they could replace the vehicle and was told they couldn't access my rental information because I was renting from an airport location. Why in the world are they on different systems that can't interact? Two days later I called roadside again and the person could not get ahold of the local airport location but could see their inventory and told me that a vehicle should be available if I show up and tell them we tried to call ahead and I needed a vehicle. They did have some SUVs but they were slotted for pickup later in the day, so they sent me off with a mini-van instead. This was an acceptable replacement for me and I was just glad to have the issue finally resolved. The whole experience was quite overwhelming, and I would hope that such a simple issue could be resolved more quickly and easily.