I have quite a few thoughts on this, firstly it is unpolicable, secondly servicing is DIYable.
The main reasons for crashing are
Old tyres, need to change them every 5 to 7 years
Poor loading, over heavy or too light over the tow hitch will cause massive stability problems.
Unsuitable tow cars, Golfs and Astras have been seen towing twin axle caravans

Too fast down hill - the most unstable condition, can be made a LOT worse by inconsiderate lorry drivers coasting up to 70mph or more.
Factors to make it worse
Strong cross winds, if you do not expect them they can cause havok
Lorries & coaches overtaking, they produce huge bow waves which can make it very unnerving on motorways, especially when they have removed their limiters (quite common - get one per long trip quite often).
idiots in cars, this caused my only significant snake, I pulled out to pass a lorry and an impatient TIC went up the inside pulled in front of me and I had to swerve to miss him.