turbo boost at 2 to 12 psi uphill under load - no codes

[tidy rabbit]

I've noticed a small decline in performance going over the mountains hauling a large horse trailer with 10ft living quarters.
Yesterday the turbo boost was around 2 to 12psi. No warnings, codes etc... just poor performance. The coolant, transmission and oil were all at normal range.
2013 Ram 6.7L cummings turbo
113K miles
Is it possible that a cleaner would help? If so, which one to try?

I found this online:

Mopar 68044565AB Turbocharger Cleaner

Mopar 68044565AB diesel turbocharger cleaner is used to remove the carbon and soot deposits from the nozzle on the hot side of your 6.7L Cumins VGT turbocharger. The Mopar turbocharger cleaning solution removes the soot buildup and is approved for use on all gasoline and diesel-powered engines...

klmperformance.com

Is there a good tutorial video to watch? Is the "special tool" required? Or is there some tool I'd already have that will work just as well?