People all have their different opinions on hitches, but I always recommend that one goes with one of the more proven manufacturers - especially if you are going to tow for any distance. We have an EQ that we've been using for 10 years and have been very happy with it.
As for towing, weight clearly should not be a problem. I don't think you'll see a huge change going from 19 to 26. With the exception of needing to be a bit more selective in gas stations at times (something you are likely already accustomed to with a Diesel), just watch your increased tailswing and cornerin-angle and you'll be fine. From a handling perspective, you won't even notice.