Twenty five years ago we had a Coleman folding trailer and were sitting around at the campground. We were using our '76 Impala, RWD, 350 V8 to tow...no problem.
A man came to our campground and had the same Coleman folder trailer, but was using a new (at the time) Toyota Tercel, 1.5 liter, 4 speed standard. It was his family's first trip. He said he had come 50 miles towing the trailer on flat, prairie roads, with the Tercel. He asked us if our engine was overheaing and how fast could we tow our Coleman. I said the 350 V8 was running at normal temp and we were traveling at the speed limit (65mph) with no problems.
He replied that his 1.5 liter four's engine temp gauge was running close to the red mark and that all they could get out of the car, towing the trailer, was 50 mph...flat out.
He said for the summer holiday they planned to tow the trailer over the Rockies, but with this initial 50 mile run of flat land, he was having misgivings.
I told him his car, engine, brakes, cooling system, etc...were too small for towing the trailer. I told him he needs a bigger, more powerful vehicle as obviously his car was not up to towing.
He told me the trailer salesman said his Tercel could handle the trailer no problem.
I rest my case.