I'm just an old pikey, how would I know
If anyone wants to work it out, do feel free.
Huge BT van fibreglass box section bolted to a large (caravan?) chassis.
Contents were solid oak sideboard measuring 6' long, 2' wide and 3' tall. Matching corner cupboard 6' tall, 2' each 'side', with two leaded glass doors above and solid oak doors below.
1960s three piece suite - solid wood, not the packing crate stuff you get these days - with matching footstool (with inlaid plate glass).
Double futon
Two solid wood gliding chairs (not rockers).
Spent most of the time in 5th gear & dropped to 4th in advance of the hills so I never really noticed any difference.
As for braking, as with my normal driving, I tend to look ahead & adjust my speed to suit so mostly decellerating & dropping down the box to utilise the engine's braking ability but the odd occasion where this was not possible the old girl didn't complain (and the trailer is braked as well).
One thing I will say about the BT conversion is that the trailer is quite nose heavy as the wheels have to be placed towards the rear of the outfit rather than midway. I tried to compensate for this by placing the oak sideboard across the back doors and putting the sofa on top of it. Even so, I wasn't overjoyed with the noseweight.
But my dobbin coped admirably.