3.4
Mass of the User Payload
3.4.1
The Mass of the User Payload is the difference between the MPTLM and the
MRO. It is the motor caravans carrying capacity for everything placed in or on the
vehicle, including the passengers. Please note that a driver (at 75kg, 11st 121b) is
included in the MRO. Everything listed in italics below must be subtracted from
the payload.
3.4.2
Mass of the Conventional Load
The Conventional Load is the mass o f the passengers carried and must be
subtracted from the payload. The “EC standard person” weighs 75kg (11st 12ib).
The user should adjust the figure according to the mass and number of
passengers carried.
Motorhome Manufacturers designate passenger seats as
being suitable for travelling, and provide seat belts accordingly. Multiplying the
weight o f the passengers by the number o f passengers gives the Conventional
Load. Please note that a driver (at 75kg, 11st 121b) is included in the MRO.
3.4.3
Essential Habitation Equipment
For the purpose o f EN1646-2, the mass o f the Essential Habitation Equipment
includes the mass o f the following:
- the LPG cylinders, full.
//.
- 90% o f the fresh water.
Hi.
- the water system, full.
iv.
- the waste water tank, empty.
V.
- the toilet system flushing tank (if fitted) empty.
vi.
- the toilet system holding tank (if fitted) empty.
All o f these must be subtracted from the user payload.
Auto-Sleepers include the low voltage (230V) connection cable and the second
battery in the mass in running order.
3.4.4 Options, Personal effects and Accessories
When options, personal effects and accessories are fitted or carried the mass
must be subtracted from the user payload. A ll optional equipment whether on the
base vehicle or part o f the conversion is excluded from the mass in running order.
Personal effects are any items o f any description carried by the vehicle.
To determine accurately if a vehicle is exceeding one o f its maximum technically
permissible laden masses, the vehicle with all o f its load (that is passengers,
contents, luggage and external load) should be weighed on a weighbridge.
You may wish to allocate the user payload to suit you r own use. For example, to
increase the available payload, the water system m ay be emptied. If the vehicle
is not being used for camping the gas bottles can be left at home to increase the
mass available for other items.
3.5
Gross Train Mass (GTM)
3.5.1
If you are towing a trailer with your Auto-Sleeper, the Gross Train Mass is the
maximum allowable weight of the towing vehicle, the trailer and the mass of
every item carried. The GTM is given by the base vehicle manufacturer and is
unaffected by the Auto-Sleeper conversion. Please check your driving licence to
ensure you allowed to drive a vehicle combination at this weight.
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