I went with a 4×10 trailer here to save money on materials. 5×10 would have demand more non-standard size material. I put a car in front of it to see how things would feel. I couldn’t find a 2012 Kia Soul in a BIM file anywhere, so I went with the Kia Sportage. They’re roughly the same width and height, give or take.
This whole project is meat to come up with a build to easily be towed behind a little car. I have a 2.0ℓ engine in my Soul.