This is a solid recommendation spoken from experience. I have towed over 20,000 mile each year for the past five years and I concur.
As an analog, look at big truck tractors. The have "live" axle rear ends, big digits and multi-gear trannies, diesel, etc. some of those rigs will tow a million miles or more in two to four years. I would say they know something.
A good truck chassis, tow proven tranny and suspension is a must.