What they are saying sounds pretty much like good info.
The only way to know is to "know". Read the sticky thread about legal weights. It outlines what you must or should obey as far as the law is concern ( weight limits of front and rear axles and tires).
If that criteria is met, it comes down to will the tv pull the tt at a reasonable speed.
Then you will have a better expectation of if you should even consider this. This information comes from someone who has tried to tow a tt through hills with an under rated vehicle. Yes it did the job, point A to point B, but I was not willing to do it again.