I have 20 + years of towing in my former vehicle which had a 4.3. I did rental trailers until we purchased our pop-up in July 1995. Our Pop-up weighed right at 3,000. I have also pulled trailers for friends, as well as our BSA troop trailer. Then in 2012 we purchased a 21 foot self contained trailer weighting 4,000 + . Pulled it for the past 3 years. I ran 87 octane in normal day to day driving, but I will fill up with 91 when pulling a trailer. When my tow vehicle died it had 338,000+ miles. There were several occasions when the troop borrowed my vehicle without either hubby or I going on that trip. When you can seat 7, tow a vehicle, and have extra room for gear, you are pretty popular with a BSA troop.
That engine overheated due to a cooling issue, nothing to do with the engine. I am a bit sad, we were planning on keeping it another couple of years and wanted to see how many more miles were were going to put on that engine before it died.
Since I am planning on keeping my new truck for 20 + years, I will do the a repeat on how much octane to put into the tank when pulling a tow vehicle. We also run a 100% synthetic oil called Amsoil. When an engine can continue to run pulling a 2 ton trailer with that much age/ mileage (and do it well) speaks volumes about the the engine oil and the soundness of the engine. My hubby was working on engines as soon as he could hold a wrench. By the time he was in high school he was teaching the teacher stuff about engines and cars.
I am ordering my tow mirrors in the next day or two. Then I will be ready to test the new truck and see how it does pulling the trailer. With this bigger engine, I doubt I am sure that it is going to be a dream to pull a trailer as small as this one. My hubby already asked if we were going to be getting a bigger trailer. LOL. My theme song for this summer may be "On the road again."