Needed maintenance for road trips

Hi! I’ve been wanting to take my car on longer road trips and with the recent loss of my coolant expansion tank I’ve been fairly worried about shit like this happening miles out. I’ve been racking my brain for what more I should get done to at least be a little more secure taking her farther. 190,000 miles Things are done: Spark plugs/coils, Intake manifold tubing, Air rail, MAF, DISA, Throttlebody refresh, Starter, Battery, Radiator hoses (done at 140k), Coolant tank (soon lol), Fuel filter, Fuel pump, Clutch master/slave, Clutch assembly, Wheel bearing and hub, Diff refresh coming soon, Brake fluid, Trans fluid, Oil, Diff fluid, All of these have been done in the last 4/5k miles. The car has a minor leak at the oil pan gasket but I can’t currently do it due to moving garages

Thanks