The facts: not one on here will now. Every TV/TT combo is a little different. Based on Ratings, seem to me cutting it close because the dry TW rating is often without options (many of which are mandatory). The high profile of TTs are more influenced by wind than any other trailer type.
What is the risk and what is the reward? Risks? Trailer sway due to light front end of TV and possible winds on any random day you choose to tow. It seems that you have some experience towing other TV/TT combos and understand enough physics to react to the situations. Reward: Might save $500 max? I dunno about that savings today.
I purchased my TT from a dealer 2 hours away and paid $600 for Reese Strait Line installed. I could have saved $150 buying that WDH online and installed it myself. Installation is a couple hour process including adjustment. The most likely case based on feedback n this forum is the RV dealer does not adjust correctly for your TV/TT combo. That risk can be mitigated by learning how to adjust and double checking the dealer's installation/adjustment.
If it were me: If the dealer was willing to install my desired WDH for <$200, I'd let them try. It is their service department's job and they likely install hundreds (thousands) every year. Statistically they are probably at least 95% right or their reviews/ratings would stink. Those 5% tend to complain, loudly. But for $200+ delta cost, I'd be willing to tow that with your truck without WDH/sway control. I believe Ford recommend only restoring 25% removed front axle weight with WDH, so Ford engineers think the stability should still be good with a relatively light front end at even 1200 ponds of TW, let alone <500.
A & A parents of DD 2005, DS1 2007, DS2 2009
2011 Suburban 2500 6.0L 3.73 pulling 2011 Heartland North Trail 28BRS
2017 Subaru Outback 3.6R
2x 2023 Chevrolet Bolt EUV (Gray and Black Twins)