Not sure if this is too late, but here’s my .02. We have an SLT with max tow pkg., we tow a 6900/7k trailer. There is sag. The alleged key is in the adjustment of the wdh and ball angle. By changing these two things, we reduced the sage by 1.75”. Is it perfectly level? No. With the integrated pkg, we are able to see the miles placed on the trailer, any maintenance issues that the trailer may have (none yet), it also ‘shifts’ differently to keep the maximum amount of power so we are able to accelerate somewhat as easily as when we aren’t towing, & bonus, I get to watch my engine temperature. Plus the integrated brake control feels priceless.
I have zero idea if any of these features are available without the MTP, this is just our experience.