First off John I want to thank you from all of us here for the great information and creative solutions you've provided us as a group. It's people like you, adventurous and creative and willing to share that make a discussion thread like this a valuable tool for current and prospective Challenger owners!
I love the bay slide and think that is something I'll be doing this summer for sure.
To each his or her own with regards to which type the Vacuum they prefer. Yours is definitely an elegant answer to lugging around a household unit. I like my little Dyson DC35 though :D
Now regarding the weight issue. This is a serious and worrisome reality for us Challenger 37DT owners with the two slides and water tank on the passenger side. I received a message early on from an owner that didn't want his comment out in the open regarding this issue. It seems that the passenger side is already heavy and with adding water and filling up all of those large storage bays, this side becomes so heavy that the suspension suffers and begins to fail earlier than the drivers side. I don't know this to be a fact but in light of your findings regarding the weights, it very well could be. I for one will reevaluate how I load my underneath storage as well as how much water I carry.
The Pilot station near me only weighs Axel load, not wheel load so knowing this going in I know I'll need to consider this when setting my tire inflation pressures. Can you post the wheel weights you found when you weighed yours and tell us if it was empty or loaded? That would be really helpful.
I have Michelin 22.5" tires on my Challenger so I use the manufacturers guidelines posted here: Michelin North America RV Load & Inflation Tables
Properly inflated tires increase life as well as ride characteristics. I was also running 90psi in the front of my Outlaw. When I found that the actual axle weight only called for 70psi the ride really smoothed out a lot.
Regarding my choice for keeping an eye on the duals in the rear of my motor home I have been using a pressure balancing unit developed by Dual Dynamics and called the Crossfire: Dual Dynamics
I like this more than anything because it provides me with a single point at which to add air to my Duals. The visual indicator shows you the pressure condition at a glance leaving me only having to check the front pressures at fuel stops. Allowing the pressure to balance between the inner and outer tire is a great benefit when it comes to tire wear. Our inner steel wheels get quite a bit hotter than the aluminum outer compounded by their surrounding the brake rotors and calipers. You order them based on the pressure you plan on running. They are calibrated on that pressure to allow air to move in between the two but if there is a pressure change between the two greater then 10 percent the check valve closes protecting the good tire from loosing its air as well. The visual indicators then shows black warning you of an issue.
If I were and over the road trucker, I'd find the lengths we go to as operators of motor homes in an effort to avoid a blow out a bit of over kill as you rarely see tire pressure monitors or pressure balancers on big rigs. Constant monitoring temperature, pressure, and appearance seems to serve them well enough and they are moving constantly. As a group however, we like to think gadgets are the better answer.
I used to use a TST tire pressure monitoring system. After a trip south and back the salt on the roads caused galvanic corrosion between the sensor and my valve stems. I had to get 5 of 6 cut off the valve stems because these sensors we made using cheap materials rather than brass. Do the math! 6x dismount / reinstall new stems / remount / balance. I had no idea this could have happened but nothing goes on my valve stems unless it's stainless steel, plastic or brass! If anyone here wants my old TST system send me a PM. They only offered to replace my sensors but there's no way this unit will ever be used by me so it's been sitting in my garage for the last year and a half. I wouldn't feel right selling it knowing this could happen to someone else.