reviving this one

as i got back on track with the caravan which of course was not bought last year. now i'm back on the topic and with a bit more of knowledge (or at least I'd like to think so)
i keep looking for caravans and change my mind several times. now i'm focusing a lot on the weights. My car has a two limit of 2000kg and towball vertical load limit of 84kg. when searching for caravans, the only resource i have to check the fit is towcar.info.
now comes the question: the caravan that would suit my needs would be (with all equipment and some user payload) roughly 1600 kg which even fits in the 85% theory, BUT my towball load (as per towbar.info) would be 90 kg (6 kg over the limit). can drop caravan load from 200 to 150 and it shows towball load as 85 kg (only 1 kg over the limit)Is that an issue or not? How is that calculated? I know I can balance the caravan but having no experience in this I'm not quite sure how it works in real life. Yeah I'm aware of static load vs dynamic load, so definitely when driving this will be much higher. In the end I want to enjoy the ride and be safe.
and the other question is related to airmatic: is airmatic ok for towing? will there be to much of a stress on the airbags?
any feedback is much appreciated and sorry if the questions are stupid :\