Looked at my first 13 Scamp today

[Roger H]

Thanks. Anyone know approximately when they switched to the new blade style?

Actually, the seven pole "Bargman" style connectors became the defacto standard sometime during the mid-'90s. The seven-pole connector with all round pins is a truck connector commonly used on 18 wheel semis and is still available through truck supply houses and at most truck stops.

The round six-pin connector is still in common use.

Scamp, being a custom manufacturer, will supply pretty much whatever connector you specify on a new trailer, so while most of them are now (and have been for the past several years) shipped with the "Bargman" style connector, there's no guarantee that any specific trailer you look at will be so equipped.

Roger

[Brian B-P]

... or worst case, I cut the connector I got off, and attach a round pin one.

If by some chance the Scamp comes with a connector with seven round pins, I suggest replacing it (the trailer connector) with a "Bargman" or "RV" or "flat pin / blade" style connector. The "trailer hitch guy" is right - this is the common setup, and the only one appropriate for use with electric trailer brakes. It would be far more useful for the tow vehicle to be set up with the RV connector than a mis-application of the round-pin commercial connector, and far more likely that an alternate tow vehicle could readily pull the Scamp if it has the RV connector.