Re: small transom saver?
I have the same size boat and motor. I bought a regular frame-mount transom-saver and use it always when trailering. I got tired of watching the outboard bounce and flex the transom. Ignore the tilt-trim thing. Your 6hp won't stress anything, I guarantee.
If you have a roller right at the transom, you can use the roller-style saver. If not, the frame-mounted one works great. A bracket bolts to the rear crossmember, then the transom-saver fits there, with a pin to hold it in place. The transom-saver comes with a strap to secure the outboard.
It'll be a good investment, I guarantee, and you can concentrate on driving, rather than watching your outboard bounce.