I have had great longevity in the past with the chevy 5.3. Its a solid engine. RAM 5.7 is good too. the 6.2 is overkill for the 5,000 lb trailer I tow.Chevy 6.2 or Ram 5.7.
But by the time I finish investing in my ecoboost, I'll most likely be driving it for the new future.