Today, I took a garbage can of recycles (glass and plastic) to the recycle center (2.2 miles away), along with two large Rubbermaid bins for Goodwill (4.8 miles further). I don't know how much they weighed.

On the way back, we stopped and got sand and a bio-solid soil amendment. It was about 2 miles to home from where we got the sand. The bottom bin is filled to the ridge with sand. The top bin is sitting on top of the sand and has the bio-solid amendment in it. Sand/bio-solid amendment ~325 pounds + my kid ~50 pounds. We took it slow and it was really heavy, but we and the trailer handled it just fine. I wouldn't hesitate to do it again. Total distance and time: 12 miles, 1 hour 20 minutes riding time.