Driving Ponies
I have Mot prepped many horseboxes
and all i do for mot is if the screen is on the dash board covering the view, is simply remove the moniter and push wires inside dash for test,
VOSA cant fail something that is not there, its not being sneaky really as everyone does it
with regard to lights, if they are fitted they must work so if you have marker lights along the top of the body sides they must all be working, although not required in road traffic requirements vosa like them to work, as regards normal markers, a rule of thumb that has never let me down is, a marker light within a metre of the front of the vehicle and a marker within a metre front the rearmost point of vehicle, then every three metres in between, your being a 7.5t will probably only have a centre marker and front and rear markers,
as long as the light shines to the side and is amber its a marker lamp so your front side light counts as a marker with a metre of the front.
also with these markers they must be a reflector, most marker lamps have reflecotrs built in but some dont so be careful, a simple stick on reflector will do.
more recent checks at mot are things like seat belts, make sure webbing is not frayyed and they click into clasp ok, if new enough to be fitted that is.
ask for volutary headlamp check as is one of the most common failiures, do this before test also a volutary brake test, if you get chance do this and headlamp check maybe a week before test, if you cant do this, brakes is another hot failure point, as horseboxes tend to sit for a few months sometimes and brakes glaze over, easy way is on way to test is drive it like you stole it, brake late, to get brakes hot or pull park brake on very slightly whilst driving and i mean slightly to warm up brakes,
if she is a smoky ole girl maybe change fuel filters before test and blow out air filter to get emmissions lower or a good run around before test.
beware the law has changed and i think its 04 onwards 7.5t must have speed limiters fitted, not sure if this applies to horseboxes, but not a bad idea for such a valuable load,
if you have a knob on steering wheel for spinning wheel fast, take it off for test, if it has damaged steering wheel which they usually do wrap some tape around it,
i can also say some coach builders wiring to rear lights especailly , is shocking considering the cost of the vehicle, it seems a case of what the customer cant see they wont worry about.
hope this helps
if you need any more info just ask and ill try and help
pete