Flat towing

Turrell2121

i wish to flat tow a small car behind our motorhome, at the caravan show in bumingham this year we set out to find a frame companys.the seem
to argue against each other stating what the law is,the one that sounds the best have an electric pump in the tow car that keeps the servo topped up, so when the breaks are applied in the motorhome its the same as sitting in the tow car. the other method is
the same as a caravan when the tow car catches up the breaks are applied this makes the A frame heavy and not easy to store. but am still confused as to which one and how it stands in law. any one out there tows behind a motorhome love to here from you