Thanks for that.
Yes, I checked on towcar & it says the match is perfect with a weight ratio of 74% & a performance rate of 62. Only category I have less than 4 stars is overtaking (which I rarely do as I'm a 'plodder' driver) & steep hills, only 2 stars setting off on a steep hill, which is to be expected.
I researched before I bought the van as I love my little fiat & want to keep her forever, but then I over-researched & didn't give up before I came across some doom merchants!!! Ha ha.
I'm sure I'll be fine, the panic is subsiding :-)