What maintenance tasks are essential for severe towing on a 2018 diesel pickup?

[SavannahD]

I rely on my 2018 diesel pickup for towing a heavy equipment trailer weekly for my contracting business, and I'm trying to establish a more rigorous preventative truck maintenance schedule beyond the basic oil changes to avoid costly downtime. The manual outlines intervals for fluid changes and inspections, but I'm unsure which items are critical for severe service towing and which can be safely extended, particularly for the transmission, differentials, and fuel system. For other owners who use their heavy-duty trucks for similar commercial towing, what specific maintenance tasks and intervals have you found most crucial for longevity? How do you track and document your maintenance, and are there any particular aftermarket upgrades or monitoring systems you'd recommend to catch potential issues before they lead to a breakdown on the road?