Thats what I mean.....you see them sat at the back with the engine at the back....they must be dreadful........I load my caravan making sure its front heavy so theres a dip between car and van.....Ive done 80mph all day in France (where its legal) and once had a blow out where the tyre disintegrated and "drilled" a hole in the caravan floor.....I only noticed when I saw the smoke....I was doing 80mph so I just took my foot off and let it slow down on to the hard shoulder....I was dodahing myself but when I thought about it.
Not my specialist area but I think 80 is only legal IF the car / trailer have passed a specific test & the weights are within specs.