"tow haul mode" on nnbs E38 ecm and tcm?

hey guys I need help with wiring up a tow/haul switch to my swap, ive seen people do it but on gen3 ecms....

I have a nnbs 5.3 with a E38 ECM and a TCM any feedback will help, thanks.

you would need to run those circuits through the gen 4 BCM and have all the comm lines hood up so that the ECM sees the signal that it is being toggled on and off

not to hijack but i been wondering this ever since i did my swap...and now seems a perfect time to ask... is tow/haul mode possible through a simple switch (which i doubt) or is it through "class 2 data" which is obviously more involved.... (which im pretty sure it is). id love to add this to my dash but if its through " PCM talk" then its not gonnna happen in my case....