Dually questions

I blocked one tire on my duallys, doesn't give much lift at all. Need to block both the same. You do need to be able to fill and check air in all tires, if it takes extensions, do it. I have the braided flexible ones and they work well. Keep the air pressure the same in all rear tires.
Brian

If you use only one block, I would use it on the inner tire to reduce the stress on the axle.

With the Ram, the TPMS is a display only, not a warning system. So if a tire goes down, it will not notify you. For this reason, I would not tie two tires together as I wouldn't want both to go flat. Not warning is a negative to the Ram, but it is also a blessing because you can lower the tire pressure when running empty for a softer ride without having a constant light on the dash.

I would run the same pressure. The crown of the road is in the middle. Each side from the middle out is flat, not counting the ruts in the road.

1 I don't know but would assume yes.
2 I carry a compressor found it easier to get a chuck with a different angle.
3 You don't want wider tires.
4 60,000 miles on my A/T Rugged Trail duals, 50,000 towing 5th wheel 3200 pin weight. The right rear outer dual shows a little more wear than the inner and the driver side are equal. I keep them all at 65#

Just a question how often do you ride on the crown of the road? Most roads I've ever been on will slant a bit to the curb for runoff. If that is correct it could explain my rear outer dual showing more wear than the others as more weight is shifted to the curbside.

I don't like the way the tire bends with only one block, so I use two. I tried it.

There are a lot of different ways to add air including a different chuck or air gauge. They can also be misaligned. I'd get the dealer to give you a walk through on how to do it for your truck. I run the same pressure. I've never heard of the crown thing but with that logic, you should run different pressure in your outside and inside tires in the front as well.

1 block is good.
I don not have any extensions. I do have steel valve stems though.
You can go a bit wider. To go a lot you need a spacer between the wheels.
I try to run the same but it does vary. I have a readout on all 6 in the EVIC. Sometimes there is 10psi diff.

1 if you read about the tires, they can take static load like 5 times rated load, so you can put block only under 1 tire, but that will give you extra flex. Your call
2. each system is different. I had straight chuck for decades as this was the best for all dualies, but it will not fit on new Ford. Extensions can be additional source of troubles, so stay away from them unless you have TPMS.
3.don't think wider duallies are option, but you can find super-dual or whatever they call it.
4. same pressure. You can buy pressure equalizer, what IMHO combined with added TPMS is the best of all worlds.
I own duallies for years, but lately it is my primary vehicle. Looking at SRW truck, I am getting impression that it is unfinished. ;)