We pulled a trailer with ours for quite a while
Even a smaller trailer like this was a struggle once up to 9400ft. It did the job, but a couple more cylinders makes it much easier and gets better mileage.
I think you can probably pull a 3300lb trailer, but it would likely need to be a flatlander. A fullsize truck may be a better match.
We went to a fullsize:
The E1 is a 3500# trailer. The Avalanche pulls it nicely. I am very sure I would not want to pull it with the old S-10.