I've seen those as well. Looked good, but nearly the same cost as a 2-burner. What's the logic of that? I don't get it.

Regarding the use of an external bulk tank:

When I tried this with a cheapo Yanes two-burner, using the regulator/adapter I have, I found that it burned way too hot. This was with a 5-lb refillable tank. The pot supports were glowing bright orange. I damped down the tank valve by roughly 50% and the burner valves by a third.

The Colemans can probably take a bit more. But be aware that a bulk tank can supply a lot more pressure than a 1-lb tank and adjust accordingly.