If you are over heating your Eco-boost, it's your own fault for towing too much trailer. I go up Parley's all the time-plenty of Eco-boost towing that grade that are not over heating. I don't believe it's common.NHT is awesome, a must have imo, and only about 2% additional. And people do overheat their half tons towing, ask the ecoboost high altitude people towing heavy. I would likely go 3/4 ton gas if i was ordering a new GM but i would not skip NHT if i was ordering a 1500.
Getting that much capability while still being in a light halfton that daily drives better than a 3/4 ton is huge. You get all this for $1125: