Major Sway Problems! Any ideas!?

Hey everyone! First off, thanks for the responses. Some are great, others are missing the point. To the ones who are screaming "slow down", I clearly wrote that I ran 65mph the entire time, and at that speed the trailer would still sway to some concern. I'm not trying to keep up with the Joneses per se, but when more than 1/2 ton blows my 3/4 ton's doors off with bigger travel trailers than mine, something has me wondering! Yesterday I saw a hundred travel trailers pass me in a 5-6 hour drive. I was clearly the slowest guy out being limited by the sway issue on one of the smallest travel trailers I saw out yesterday. This being said, I'm going to look into the tongue weight issue. I had very little I'm sure.

Also, I did have weight distribution so that won't help my tongue weight issue. I will get some weights this week some time. Thanks!