As a matter of interest I've been towing since age 13, ok that was on a farm, but it was still 65 years ago. In respect of caravans, I've been towing since 1980. Back then, it was with Maxis (about 980kg towing limit) and a relatively lightweight – 780kg I believe – caravan. What I found was that up to about 40mph, or maybe 45, can't remember which, the outfit was unconditionally stable. At 50mph, it was stable until the bow-wave of an overtaking vehicle, and coaches were the worst, caused the caravan to start "wobbling", ie a pre-cursor to a full snake. Dropping the speed to 40 or so immediately stopped it, but I also learned to watch the mirror very carefully, and pull over towards the nearside as far as I could when being overtaken. Generally that prevented the problem.
Since then both car & caravan weights have increased, and certainly with the last three cars I've never had a problem with towing at the appropriate limit. Having said that, the caravan weights have been well within the maximum allowed for the car, although above the much quoted 85% ratio. But, I, or we as "The Boss" does some towing, always stick to the appropriate limit for our outfit. I did once try thrashing the outfit southbound on the A74M, but still within the limit – and paid the price in a very heavy fuel consumption. Never again!
A lot of caravan towers swear by a so-called stabilizer. I did use one for a few years, but in reality I never noticed any difference. As it happens, the present outfit has the built-in Alko stabilizer so I can no longer compare with or without.
Peter G. Shaw
An edit. The above does not make me an expert. I am merely offering my experiences. Others will think differently.
Edited By Peter G. Shaw on 09/01/2022 10:51:11