Was your trailer loaded yet or still empty? I'm guess I g you were feeling porpoising where it has a front to back bounce. It sounds like you need to adjust your wdh better. Never trust the dealer setup. If you can, get to a cat scale
and weigh your rig loaded, ready to camp. First pass, Weigh just the truck with front axle on scale pad one and rear axle on scale pad 2. Second pass weigh truck and tt without wdh bars hooked up. Have truck same as first pass, trailer axles go on scale pad 3. Third pass will be truck plus tt with wdh hooked up. Same positioning as second pass. You can now determine your tongue weight. You want to get 13-15% of loaded tt weight for your tongue weight. You want to adjust your wdh to get your front axle as close to unloaded weight as possible without going heavier. You should tow much better after this.