The wrapping one leg being detrimental thing is total hogwash.
If you don't need to wrap, don't wrap. It restricts the vascular system and when removed can actually cause stocking up.
Also please dint wrap with vet wrap. That stuff will very, very easily bow a tendon if you aren't extraordinarily careful.
As far as for the white legs, if you keep the horse well bedded on clean shavings, you shouldn't have the issue. I would wash in the am, apply clean shipping boots and make sure there are shavings in the trailer and at the show, keep the poo picked out and they will stay white. The baby powder and cornstarch will also work.
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