This sort of tells me he did good with the load - "I was worried about bottoming out the rear springs, but to the best of my knowledge, that never happened. However, the back bounced around more than usual with the empty trailer attached. Having the trailer loaded did away with that sensation."
It's better his tongue is pushing down on the car some verses having it almost balanced & lifting the rear of the car at times. Heck, I am more of a load than that Super Cub!