I just looked at my new hitch and it is a 12K! So you all have me there
Yes on the MPPT. For one it was kinda hard to tell what state the batteries where in just based on the volt meter our trailers comes with. With the Victron you can see your total collection stats accurately in addition to what stages the battery hit through the daily charge cycle. Because it's using a three stage charge cycle it's also supposed to increase battery life.
Another great upgrade was one of these mattress toppers :
https://www.amazon.com/gp/product/B00UYGA49M/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1
Still the best thing we've done so far!
RoA also shared a cool tip with me a few weeks ago in Moab. They added removable pins to the steps so that it's easy to remove them before hitting the trails. I know personally there's been a few times where I almost smoked those guys
Ok one more tip... I got this from another customer Dave... Zip tie the bolts of your suspension limiting shackles. I lost both of mine in the first month of use and ended replacing them with pinned link type shackles.