I have 2017 RAM 3500 Cummins Cab & Chassis with Aisin transmission.
The truck is used for heavy towing (20000-22000 lbs)
I am thinking about stealth DEF/DPF/EGR/SCR deletion (which means that visually everything should be in place but DEF and EGR should be turned off)

What is the best tuner to be used for this purpose?

One of mechanics recommended Raceme Ultra tuner, but I have few questions:

1. Does it support some kind of towing mode.
2. Should it be connected to ECM constantly. If yes, what would happen if something happens with the tuner on the road?
3. What kind of support Raceme has in the USA? I know they give 2 year warranty, but should it be sent to Austria or to somewhere in the USA and how long it usually takes to get the fixed device back.

Thanks