I got a chance to test the BRAKES !!!
We were heading home from a two week trip in western Montana last week. Coming down 287 near Dubois ,Wyoming we were in a real downpour doing about 45 mph pulling our 2008 25ft. Safari. I was keeping a safe distance behind a newer Corolla when all of a sudden its brake lights came on to nearly a full stop. That is when I saw a cooler size 300 lb. boulder come to a stop in front of the little car. It rolled down from a steep hillside loosened up by all the rain we had in the region. I slammed on the brakes to our F150 and squeezed the brake controller hard. All four trailer tires locked up and screeched us to a quick stop just short of hitting the car. Three guys in an on coming car stopped and rolled the rock off to the side of the road and the Corolla continued on. We pulled over to check the contents of the trailer and were glad to find nothing was out of place. The force of the sudden braking pushed us hard against the shoulder belts. Whew!!....hope that does not happen again.