Hi colin,
I tow with a 07 mondeo 2.0tdci ghia 140ps,with a kerb weight of 1571kg,Max tow weight for the mondeo is 1800kg,although i would never tow up to that weight
I tow a swift challenger 460se with a MPTLM of 1284,I know this is a reasonable differance in weight,but having said that I have seen mondeo's pulling simular vans to yours.
Performance wise I can't fault the mondeo towing arround 28/30 & solo arround 45/48 depending on how you drive,I also find that the mondeo is very comfortable & has plenty of cabin space & a rather large boot.
I would check fords web site/technical info & get the weights & diamentions for your chosen car.
To get to the 85% rule I use a little sum (85% rule is only a guide)
MPTLM of van divided by kerb weight times 100 = ????
for example mine is 1284/1571x100=81.73%
Remember if you have a motermover etc this weight can be taken from your user pay load.
All in all I think that your van is far too heavy for your chosen car.
Laird Al.