Front End Drift At Freeway Speed

Ok, so I should have realized this before, but I must not have been lined up correctly on the scale when I weighed. My trailer according to the CAT scale comes in about 200LBS lower than the dry weight, and my trailer was loaded for camping also with a 1/2 tank of fresh water. This would probably explain why the rear axle showed an enormous amount of weight. I probably won't be able to really get good scale time until next weekend, but I will do all the proper weights: hitched, unhitched. I also want to see my tongue weight. I have absolutely nothing in the back of my truck during tow and when I did my weights. I have seen suburbans pulling my trailer with lots of sag, but they were cruising on the interstate. I think I may just be a bit anal about towing safety and making sure everything is setup correctly. My truck is well within what the trailer's dims so no, I will not be getting a new truck any time soon. I am simply asking for advise, I have scoured the internet on forums and the benchmark of my problem seems to be length and a better WD hitch would seem to help this. I am not doing bags or any other upgrades.