I can't see why not, for example, I saw a trike in Reading services the other month towing a large trailer tent thing,
it seemed to large, easy 6' wide x 10' long, and the Police didn't seem bothered as they passed in the car park.
I wouldn't like trying it but, can't see any problems with small sib n trailer, personally I don't like trikes,
but the large 4x4 quads look fantastic, thinking of getting one myself for sib launching, ideal for short distance,
cheap as chips on tax/insurance and fuel.