New ST Goodyear tires

That was one of my concerns. We have had a pop-up, travel trailer and 2 fifth wheels. When we have traveled nothing unexpected moved. These tires were placed and balanced at 70lbs. I followed my husband 25 miles. The end of the rig was bouncing up down,side to side. We looked inside, drawers were open, curtain down, coffee pot out of cabinet, bottled water everywhere. The rim is not damaged, thanks to the tire monitoring system we caught is just as it happened. This was 25 miles. Can you image the damage if this had continue on a long trip? We made sure the tire company put the jack in the right place. We got the manual to see where to put it and my husband stood there and watched. We have not been on any trips since the new tires. We are going to the Hershey RV show, hence the question now. We think we are going to put 50-55 lbs and I will watch the temp and air pressure closely as we go up the road. Then stop at rest stops to see what the inside looks like. With experts saying 30 lbs to 70lbs in a tire, It was confusing to us.