Crazy to see this topic after an incident I just had last weekend. We end the year at the same campground which has a very tight turn area. I have only used my sliding hitch at this particular place, never needed it anywhere else. This year they parked an over flow camper off the edge of the turning area, I need that room to make the turn. I slid my hitch and had to stop and jack back under my trailer to complete the turn. I said all that to say the below.
(1) if you have to turn 90 degree... look at your trailer wheels
(2) If you have to turn 90 degree.... Don't Do It, you are destroying your trailer
(3) If you have to turn 90 degree to exit a campground... find another spot
I have the reflex liner in my truck. Had it put in after the hitch. If I could have I would have had it done prior to hitch install.
The reflex stays shiny wet look and mine is over 1/4 inch thick. Very happy with it.
I had Reflex sprayed in my current truck before the hitch. Very happy with this liner.
The DEF tank looks bad without nerf bars on these trucks. I have the 4" round factory bars, you can hardly see the tank with them on. As far as the off-road is concerned, I would bet you could destroy the tank easy. All that being said, I have loved all my GM trucks (all diesel engines) this one is no exception.
Love mine, bought our 337 after we walked through a few Grand Design products at our dealer. We ordered the first 337 our dealer in Ashland, Kentucky received. Very happy customer, the camper has been great.