With dollies that have surge brakes (or electric for that matter), it would seem that maximum stopping power would be limited by weight from toad's front wheels only; hence the maximum toad's braking contribution would be roughly from 50% to 65%. The rest of the toad's weight sitting over rear wheels would go unbraked. On larger toads that unbraked rear weight could approach the same weight of a small car like a Smart. Obviously there are other factors like how large the motorhome is relative to toad, and also how strong the motorhome brakes are relative to toad's or dolly's.
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