The solution would be to limit the angle to say 22 degrees max from 90 degrees of hull at rest in water.That equates roughly to a little over a foot from outside edge of hull at 4 ft depth.

The shape of the foils may take on T or evan H shape variations so--RULES might allow 2 ft from hull at max 4 ft depth i e.

The other coresponding rule might be to maintain trailering width on the basic platform but allow wings or hiking racks to extend beyond --say 4 ft each side --which would be 2 ft further out than foils.

I don't believe anyone can regulate a perfect world or perfectly safe world --unless you want everyone wrapped in bubble wrap and strapped in to the crossbeam with 4 point harness and life jackets with built in airbags --etc etc etc--heaven help us if that becomes the mentality in this sport.