heard the same I`ve got a long wheel base high top Renault master on top of the van load I want to pull a box trailer full ---- so is it on combind weight ?`You only need a tacho if it's for hire/reward , in other words carrying stuff your going to get payed for , Stig for your van I wouldn't bother you'd be able to blag your way out of not needing one
, once a tacho is fitted it has to be used , checked every 2 year and have a 6yr calibration ,