Driving Car with Trailor Law? Trailor upto 750kg i'm confused about?

My licence was passed in 2005. It says B and B1 on my licence. Searching on the.gov website it says i can drive upto 3.500kg vehicle and a trailer upto 750kg.

does it mean trailor itself 750kg max of a trailor and whatever loaded on it to a max of 750kg?

so if i drive a ford transit thats approx 2000kg, and my car trailer is 650kg empty, and i have a car on the trailer thats an audi A4 at 1,600kg will i be able to do that on my licence or have to pass a separate test?

Type of TORX screw used with a Mercury Cougar '99 shifter?

A seemingly simple issue with a bit of a tricky solution. I'm looking for the type of TORX screws used with for the shifter gaitor of a 1999 Ford/Mercury Cougar. I'm looking at the assembly diagram, but it doesn't shed any light sadly

Whorling/ Swirling noise coming from 2008 Crown Victoria Police Interceptor

I have a 2008 Ford Crown Victoria Police Interceptor. It is an EX State Trooper Car. When I drive it, the car makes a whorling/swirling kind of noise, it isn't loud like a wheel baring but you sure can notice the sound. Also it seems like when the two front tires fully rotate, they act like they (or one of them) are going into a small hole.

Ford E150 transmission leak, slipping?

Ford E150 transmission leak, slipping? - 1

Added (1). Ford E150 transmission leak, slipping.
My '97 w/4.2L V-6, 180k miles had a puddle under it upon my return from a trip. When driven tranny slipped when starting from a stop. Puddle was ATF. Dipstick shows full if not high. I've had chronic cooling system issues, on 3rd radiator & new engine at 120k due to coolant leaking into oil. Yet to crawl under to find the leak source but the dipstick reading worries me it is a coolant leak leading to an overflow leak even though no coolant is missing.