ive been a member for a while now and find it quite imformative my question is i intend to build what is a 16x6 foot twin axle flat bed trailer as ifor williams/indespension with 3500kg load i was wondering what the best size box would be for the side rails i have plans for checker plate floor all information will be greatfully recived i should say it will be as low as possible with wheels outside not under
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