Forgive me but this might be long...

UGH! Last Thursday, I picked up my new 2021 Transcend Xplor 247bh from the dealership in Sacramento. I came here and verified all of my numbers for the truck and yall were super helpful with making sure everything was dialed in as far as TV capacities go, which i greatly appreciate. Now I have a different issue.

I purchased my WDH from the dealership as this was my first trailer and I wanted to have it dialed in professionally. They only install one WDH, the Fastway E2 (which some members suggested wasn't ideal) but I figured that I would have peace of mind from having it installed correctly and professionally vs doing it myself and possibly failing. I did purchase a heavy duty torque wrench so that I could make my own adjustments at home once the trailer was loaded. Trusting the dealership was a mistake.

Red flags started going off when I arrived at the dealer and they started installing the hitch. I asked if they were going to take measurements for the hitch height and wheel wells and they insisted that they had been doing this for 30 years and don't have to take measurements as they can just look and tell if its level. I trusted them and their knowledge right about until I got on the freeway and saw my rear ladder in my mirrors wagging back and forth anytime I got over 50mph. It looks like there is about 2 inches of sway anytime I am at freeway speeds. I can't feel it pulling me around but reading others experiences on this forum make me think that any sway is too much.

I spent the weekend messing with things. I believe (but could be wrong) that the main issue is that they set the hitch ball way too high. When I went through the hitch manual to do my measurement, I noticed only a 1/2" difference in the wheel well height between hitched without weight distribution and unhitched. If the trailer is sitting around 6k lbs and only lifts the front of the truck 1/2", I feel like there must be way too much weight on the back of the trailer. Set up as they had it, it was actually lower than unhitched height on the front wheel wells with weight distribution engaged. I dropped the hitch one notch (about 1") and tightened everything back up and it was closer to what the manual suggested (returned the trailer 1/4" so 50% of the unhitched height with weight distribution engaged). I went about 10 miles from my house to an empty mall to practice backing up and again had sway on the freeway. I feel like I just don't have enough tongue weight and wonder if the ball height is still off enough to be causing my issues.

My issue is... how the heck do I find front to back level? Nothing on this trailer seems to be flat. I have small stick on levels and a 2 foot bubble level but I don't know where to measure it to make sure the trailer is actually level so I can set my ball height. Can I just set the bubble level on the tongue? I tried using the floor of the trailer in front of the refrigerator but I have no idea if the floor is flat (they didn't bother to install any of the appliances even close to level inside...)? The frame seems to not be perfectly straight so measuring the front and back distances doesn't seem accurate either but I could be wrong? I know I need to get it on the scales but at this point, I don't feel comfortable towing the 30 miles from my house to a scale to verify my concerns. I feel like any dealer nearby is going to do the same eyeball BS to dial in a new hitch so I want to see if I can get this one right before I go spending another $1000 on a hitch, especially after I paid $250 over retail for this one thinking I was going to get professional calibration. Sorry for the long read and any help is appreciated.