Hi Lynda.
Noseweight, This seems to be an endless topic,
Noseweight is the, Maximum permissable downward force on the tow ball.
Purpose made gauges are expensive, so are good quallity bathroom scales, cheap one can be out by several kgs. the choice is yours,
Whichever type you use, first the van must be level, with bathroom scales place a piece of wood to cover the scales but leave the dial clear, place a piece of broom handle or simular into the cup of the hitch, make sure hand brake is fully on and all props lifted so that the van is on the jocky wheel lower it on to the scales carefully.
To calculate noseweight
It is recomended that this should be approximately 7% of the ALW
Actual laden weight of the van,
However this may be restricted by the towing vehicle manufacturer's limit, van limit or towbar limit,
The lowest of these limits must not be exceeded, as this can cause severe instability.
I know a guy that used a purpose made gauge, but fitted it just under the edge of the cupling head, when he leaned over to read the scale it sliped off with great force smacked him in the chin broke his jaw and needed 14stiches, tough way to learn.
If you counterbalance high nose weight by moveing heavy items to the rear of the van be aware that you may end up with a sea saw effect, which again is dangerous, place heavy items over the axel.In the event of accident it was found that a van is miss loaded it may affect any insurance claim.
It is not nessary to check nose weight every time you go out as once you have it right, remember how you stored all the kit keep that way all the time and it shoud be ok, If need be make a list.
Hope this helps
Jim M