The challenge is that many of the newer vehicles do not state in their specs found in online brochures, etc what the towing capacity is. And as Carol noted, some(like the Juke) have no rating at all and having seen 'torque' referred to often in these pages I wondered if towing capacity told the whole story.
Our Dodge Caravan is fine for pulling the Boler
but it's over 6 years old and now that we are no longer hauling five of our six grandkids on trips (they've grown a bit too fast) were considering a smaller, more fuel efficient vehicle. Thought we should start narrowing the field (we rarely just jump into the purchase of big ticket items).
In a past life I drove a standard VW 411 wagon in Quebec City which has lots of hills so Jesse's analogy to driving uphill with a standard made the explanation very clear. I have, naturally, read a lot of the posts regarding the Honda.
Roger's explanation is similar to an article I read yesterday, stated "An engine produces POWER by providing a ROTATING SHAFT which can exert a given amount of TORQUE on a load at a given RPM. The amount of TORQUE the engine can exert usually varies with RPM." If I understood correctly, the longer the drive shaft the greater torque (based on one pound-foot) it creates so I would guess that means that vehicle with a longer body would likely procude more torque. And then it gets very confusing. Admittedly until yesterday I didn't realize that HP = torque x rpm. But we never bought a car with towing in mind before so the parameters have changed.
Perhaps the best 'solution' is to follow Tom's advice and forget about torque and do as George suggested and ask folks who are driving vehicles similar to the ones we are considering what their experience is.
The article Norm referred to is interesting althought Andy's simple calculation (Airstream Forums post 77) is beyond me as you have to understand and know the drive rations, etc. I can, however, relate to widened stance, lengthened wheelbase and reduced rear overhang. I'm going to pass the link on to my DH.
And on that note, thank you all of you for trying to explain what I now realise is not a subject with no simplistic one-size-fits-all answer.