Not the problem I was expecting to have

ROBERTSUNRUS wrote:

Lantley wrote:
If you want a stressful tow continue using the navigator. The Navigator will make a marginal TV at best. It has a soft suspension, poor gearing (for towing) and not really enough power. Sure you can floor it and let it rev to get a bit more power out of it. But is that really how you want to travel?
There are better more relaxing options.

At this point your observations are correct use the Navigator for now but if you plan to tow the trailer regularly you will need a more capable TV.

:) Hi, I have to disagree with your opinion. My Navigator has done a wonderful job for over ten years. Although mine has rear air suspension, it is not soft. "Poor Gearing" with the factory tow package Navigators come with 3:L73 gears. This is the most commonly used gear ratio, for towing, used with four speed automatic transmissions. Horse power isn't that bad either; People are towing with much less.

I did not go back to reread but if I recall correctly The OP's trailer GVW is 2000#s heavier and her trailer is 8' longer.
If you are happy with your Navigator that's great and I not going to try and convince you otherwise.
Nevertheless I'm not going to recommend the OP stick it out with her Navigator.
A Navigator is a decent luxury SUV, however it is not suited for towing a trailer as large as the OP's.
The OP will have a much more relaxing enjoyable experience if she gets a more capable TV.
As some advised she could floor it and take the Navigator to its limits hoping for the best. Or she could cut her losses and get a more capable TV. It's really not a close or a borderline decision in my mind.
A Navigator and a 8500# GVW TT make a poor combo. I commend the OP for giving it a shot with the Navigator, but in the end she will need another truck to tow the desired trailer