Thanks for the replies.
The reason to upplate it - i've currently got very little payload. And anyone else with a similar F250 / F350, 4x4, crew cab, with 6ft bed will be in the same situation. I didn't realise it until i put my truck on a weighbridge. Quite honestly, i don't think they should be able to plate these trucks to 3.5 tonne at IVA.
So my reasoning is, whilst ( if !) i can get it's gross weight increased, then can i also possibly tow a heavier trailer?
I realize that in the US they use electronic braking on the trailer, i know some 5th wheels here do the same. I'm not sure on the full regs over here though.
With regards to license, i'm in the process now of doing my C followed by C+E.
G