My 1984 Grand Touring bike has a "hard point" for a full trailer. I use a full sized pan Radio Flyer "Travler". It was originally purchased as my (at that time, now a pre-med student) baby girl's "stroller". Since she has out grown her stroller, I will never out grow that Radio Flyer. I used 25 calibre casings and built a McPherson strut type suspension to go along with the big tires. This full trailer arrangement can run a good 10 mpg with over 100 pounds that would be dangerous or hostile to a fabric semi-trailer. I can do 6 with 200 pounds.
OFF the bike, this Radio Flyer is used to bring Type I and Type VI motors into the house for engine work. The VW Typ I weighs in at 257 pounds. The Porsche Typ VI weighs a bit more, however, it comes into the house on the same Radio Flyer.
A wagon properly "floated" on a suspension and with proper tires does have very real possibilities.
veni, vidi, vici
Salek