Carry spares, and tools too!
IMHO, after your build which can take years determine what parts are prone to failure and carry spares, special tools, grease, belts or whatever. Don't have deep pockets then save up and get what is needed.
My Suburban has very specific parts not available in short order, example; after fabricating brackets for my second alternator I had to use an additional idler pulley w/bearings and decided on unit from a jeep, my serpentine belt is perhaps the oddest size I carry spare idler pulleys (GM/JEEP), a tensioner and four (4) belts for this mod.
I've installed redundant remote electronic fuel injection drivers (#1 reason 6.5 diesels die) so when one fails I just unplug and plug into good unit and be on my way. Even have spare lift pumps, fuel filters, injector return lines, injectors I stow in vehicle just in case.
I carry tools that no mechanics shop or dealer these days has on hand just for my diesel, both early/late full sets of GM shop manuals and run real time data logging.
I always have two (2) spare tires when going really remote I'll take two (2) more.
I'll take this Burb anywhere anytime within reason and even skip reason when needed, its my main transportation too!
1999 GMC K2500 BURBAN, NAVISTAR enhanced 6.5 td aftercooled, dual alt's, PSC p/s pump w/HD cooler, redundant FSD's, HEATH program, turbine/downpipe wrapped, 4" SS exhaust, real time OBD2 data logging w/device controller, EVANS waterless coolant @ zero (0) psi & 135 gpm pump, 4L80e w/kevlar and premium steel w/cryo treated input/output shafts running @ 100 deg. F & 140 deg F towing, all synthetic fluids, AMSOIL bypass system, MileMarker hydro, dual fuel tanks, and on and on, questions PM me.