I would update the rear with t32 Spring so the van runs more level so helping the front and stop the rear bouncing. If you do this you must still stay within 3000 kg total weight. I have a t32 Kombi and find the rear very hard as I only run with up to 300 kg of tools in the rear so when I get time I am going to swop them for t28 s . You can get them on eBay cheap and you are looking for 3 silver colour marks on them .
I build and modify cars for track days so have played around looking for the correct set up and running the rear low is only good on a mark one escort on gravel. I am not sure if the t32 has a thicker rollbar but if it does it would help keep the rear stable. I haven't towed are caravan with mine as I haven't fitted a towbar yet but tow it with a four wheel drive and that's the way to go as it has self levelling rear shocks.
I build and modify cars for track days so have played around looking for the correct set up and running the rear low is only good on a mark one escort on gravel. I am not sure if the t32 has a thicker rollbar but if it does it would help keep the rear stable. I haven't towed are caravan with mine as I haven't fitted a towbar yet but tow it with a four wheel drive and that's the way to go as it has self levelling rear shocks.