I'm preparing to make a long dive over the Thanksgiving holiday using a high mileage vehicle (Chevy 4.3 with 265k miles), and I am wondering if there are any curious/gimmicky maintenance suggestions I might consider.
With respect to vehicle's condition, the vehicle is running well so I have no immediate concerns. ::knocks on wood:: Also I'm aware of the fluid levels, and I will check air pressure in the tires prior to leaving.
I use MaxLife 5/30 high mileage oil, and I'm about 1500 miles into my current service interval, so I plan to get an oil change after the trip (it'll put me at about 4k miles on that oil).
It's worth mentioning that I intend to pull a trailer on this trip...empty on the outbound leg, full on the return leg.
All this said here's my question: Considering the length of this trip, is there any real benefit to applying fuel, oil, transmission, coolant, or other additives at the start of the trip? Since the engine is going to be burning consistently for several straight hours, is this a good time to run a course of fuel cleaners, for example, being that I will consume an entire tank of fuel in one session rather than allowing the additive's detergents to linger in the system over week or two, potentially damaging seals, etc.
Edit: Just to emphasize, this isn't a question about improving reliability, rather it's a question about maintenance.
Although I'm specifically asking about fluid additives, I welcome any tips relevant to long drive before and after maintenance.