Great real-world feedback - thank you.
If I were going to haul the tractor frequently a tandem would be the clear choice, but a couple times a year makes me think it should be OK. Towed it only once before, on a rusty 10ft steel trailer that likely weighs 900#, so 3-400 less payload capacity than the Aluma 6312 - the model I am considering. Stuck to the 2 lane road (vs. the expressway) and it was fine.
The aluminum tandems I see online are more than I want to spend - most well over $3500 - and I dread messing with a 1500# (or more) steel tandem for the next 10 years (unless it rusts out sooner!). The Aluma would be so much easier for other duties like lumber, etc.
Renting would make the most sense $ wise, but would like to have a trailer available at our lake cabin....especially since my wife so sweetly got me a Polaris 500 side-by-side (for Christmas!) that is headed down there.