I tow with a 2.0 hdi picasso with no problems whatsoever.also, my mate tows a 1100kg avondale with his 1.6i picasso again with no problems (although he says it does struggle a little on hills).
You dont mention whether or not you currently have a picasso or are thinking of buying one? or is it you have a picasso and want to start towing a van?
Is there any more info you can give?
Regards
Andrew
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