Here is my 2007 Yaris towing our 1989 Skamper Pop Up camper. I also added a bike rack to the camper. You can see from the photo, if you look close, I had to add some extra weight to the tongue of the trailer to reduce sway. The bikes take too much weight off the tongue. The car is
packed for the camping trip too. It tows great but on big hills I drop it down into "3" for some added power. The car likes to go 70 but the trailer likes 60 better. I tow this trailer in the middle of summer, 99 degrees, up to 150 miles without any problems. Their are not a lot of hills in South Alabama and North Florida, I wouldn't want to take it into the mountains. I have a Draw-Tite Hitch and it was
easy to install. I plan to add two kayak racks for two kayaks to the top of the camper this summer. I have no idea how much the camper weighs but I tested it hard locally before making a long trip. When the wind is blowing or it is raining I keep it at 55mph or less. On our last trip we averaged exactly 25 mpg. Oh, and it tows so easy I sometimes forget it is back there.