They do the job. Just have reasonable expectations of it.
Had a friend follow me across I-80 & 90 from NJ to SD driving on of those towing a ~6000 TT. I had a 9500# 5th behind my 13' PSD. Simply put they could not keep up. We swapped positions and I followed. Slowly. A v10 of that vintage would be much stronger. I've towed a large 5th with one, it did reasonable well.
So staying local, acceptable. Long distance or mountainous terrain... pass. JMO.