I see flirting as banter to make sexual/romantic intentions known.

That’s basically what it is. It’s not there to make someone develop feelings, it’s a way to safely make your feeling known and see if they are reciprocated. It’s basically lowering the risk of rejection, if the feeling isn’t mutual and you don’t get a response you can just write it off as a harmless flirt. If (s)he flirts back you can dial it up a notch.

most vans are limited to around 750 kg, whereas trucks typically offer much more. Mine can tow up to 3000 kg.

Yeah that’s bullshit. Vans that can do the max of 3500kg are common as fuck. You probably looked at the wrong spec. 750kg is the max for a trailer without brakes, regardless of type of car. There are usually two numbers on the spec sheet, one for max towing weight for unbraked trailers and one for braked trailers.