Towbars and Towing Mirrors

Evening all

I'm after more advice please!  The motorhome is now officially up for sale, and I collect our new-to-us caravan at the end of the month.  My car is due to have a towbar fitted next weekend and the company doing the fitting asked if it was for an Al-ko hitch.  I said no, but it has a Winterhoff stabiliser fitted (bpw chassis).  They advised I would still need the Al-ko towball.  I called the caravan dealer to confirm if this was correct and I'm sure the person I spoke with knew less about towing than me, and I know next to nothing!  So eventually we arrived at the Al-ko towball is fine as the fit is standard and if I change the caravan (not something I'm planning given we haven't bought this one yet!) it would probably have an Al-ko next time as that seems to be the current 'standard', so my towbar would be ready. I'm less convinced by that argument than the fact that I think both Al-ko and Winterhoff would require a dry (rather than greased) towball?

So now I'm seeking the guidance of people that actually know what they are talking about (you!) and wonder if you could confirm for me please what I need?

Also, towing mirrors.  I used the Milenco Aero mirrors on my towing lesson (not in my car) but found myself only using the wing mirrors because being quite short I had the seat quite a long way forwards, and to look in the towing mirrors I felt like I was having to twist to use them.  I'm hoping that once I'm in my own car my driving position will be better suited to the addition of towing mirrors.  However, I came across the Milenco Grand Aero 3 (flat) mirrors and wondered if I might find these easier, especially as I'm used to the larger mirrors on the motorhome?  So any opinions on the standard Aero 3 versus the Grand Aero 3?

Thanks as always

Daisy2