A friend of mine, put super singles on a single axle dump truck, he didnt like it so he took them off. I never heard him say why he didnt like them
Air ride, a favorite subject of mine. About a year ago I replied to a similar thread about air ride dump trucks and I said then I would never buy another one
HUMMM about 5 months ago I bought another (air ride quad dump truck) Sold it about a month ago, this is my last one
Some of the things that the drivers complained about was the truck leaning over in curves (while loaded)
Having to remember to dump the air bags, if you are on uneven ground
Remembering to inflate the air bags, if you dont the load just sets there and bounces on the rear end housing, thus cracks the a housing (I had it happen twice)
Seems like air ride gets stuck in soft ground quicker, than a non air ride (my opinion, backed with experience)
Always worrying about is the air bag going to bust, with a load of asphalt on it where I cant dump my load (my opinion, backed with bad experience with this, load of asphalt $2000)
Dump bed not level, loaded. If you are loaded uneven, the truck leans to one side. The only way I ever corrected this issue was to put two leveling valves on the truck, then are two valves you have to keep adjusted or repaired
The positive side, they ride more comfortable than the walker beams
Final few thoughts
I own 4 dump trucks, and I do contract hauling, mostly asphalt and rock. Air ride trucks are mostly converted road tractors, so they are mostly single frame.
I think if you are a owner operator (you are going to drive it yourself) if you get a good deal on a air ride, you probably can put up with the negative stuff. The 8 bag air ride is better suited for dump trucks verses the four bag system. I know there are a bunch of people using air ride dumps and like them, but its not me NEVER again.
I dont understand the allision transmission question, but if you are asking how is the automatic verses standard trannies. I have owned 3 automatics and I loved them, them pulled good in soft ground, didnt get stuck as often as the straight shift, doesnt ring drive shafts like the straight shift.
My first air ride truck was a Mack 1996. It was a road tractor and I converted it to a dump truck. I forgot the model but it was the newer style, not the R or RD model. I sold it about 4 years ago, the guy I sold it to is still running it. It had the E7 Mack engine and all he has done is replace the turbo.
The best trucks I have ever owned in ex-state trucks. I have a 1984 Ford L9000 factory tandem dump, 120,000 miles Cummins Big Cam, Jake brake that works, great interior. Try to go to a State sale and check them out
Sorry for the long reply, everyone can wake up now Im finished