I've gone to using the winch strap (primary holding power) and safety chain (in case the strap breaks, the winch lets go, or the hook breaks) from the bow eye to the winch tower, a ratchet strap from the bow eye down to the trailer frame (keeps the bow from bouncing), a strap over the engine pod to both rear trailer corners (keeps the boat from falling off the trailer sideways.) The latter would be the equivalent of transom straps on a boat that has no motor extension.
For motor protection, I use a transom saver, though in my case, I run it between the lower unit and the transom (my boat is a welded plate boat; I'm not too worried about transom damage.)
Hope this helps;
jky
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