don't have an HQ, but my dominator pulls fantastic tanks empty or full, even at higher speeds.
A couple of tips and updates on the Black Series HQ12. I did a couple more experiments on towing with different tank levels. It tows extremely stable with both drinking water tanks 100% full or 100% empty; no sway at all. This weekend I emptied freshwater and drinking water tanks prior to returning home, the grey water and black water tanks were at 75%, towed fine. I think the issue with swaying with my setup was the tanks being at 50% which makes sense since there would be more space for water in the tanks to create a back and forth motion while driving. I hope this helps someone who might be experiencing any issue with sway. Also, just a note, on the first startup of the heater the initial burnoff might trigger the smoke sensor. Mine went off once and then after it didn't do that again. During the first use, you could smell a slight furnace odor but quickly went away. One more recommendation, getting a portable generator makes offshore camping AWESOME. I bought a 3500 watt at Harbor freight (Predator) and was extremely happy with how quiet it was. I highly recommend it! In a couple of hours, you can charge your batteries 100% and also being able to run your AC. You're supposed to get about 11 hours of run time on one tank of gas.Hi All, I just bought a new 2021 HQ-12, towing with a Tundra Crewmax, 4x4, 5.7L with Fox 2.5 adjustable coil-overs, lifted maybe 3 inches. Extremely pleased so far after our first weekend out. I noticed that when the tanks are 100% full (freshwater and drinking water) the tow was perfect, I didn't really push it on the highway maybe up to 70 max, but kept it around 60-65. Smooth as could be, extremely stable, zero sway. After the weekend, I decided that I would empty the tanks when I got back to my RV storage. The grey water tank was at about 50%, black water tank 45% full upon the end of the weekend. Immediately once on the freeway, I noticed it started swaying at about 62-64 MPH and got worse the longer I stayed at that speed. It was actually a little concerning. Any suggestions? I was thinking about adding Airlifts to the Tundra, and also I want to upgrade the tires on the trailer to a 10ply or something similar to what I run on my truck. Aside from this, we love it! Seems to be built solid, and I agree with some of the other posts, the bed needs to be topped with memory foam or something similar. Oh, and the TV speakers were the worst I have seen on a TV, not really a black series issue but cheap RCA? Anyone else experience this? One more thing, I think I may add the "poop tube sewer hose mod", I like the idea of keeping that mounted under the rig and out of the way. Look forward to more posts in the future.