Wanting to keep your overhead low and your 13 being paid for I would set aside some cash for “repairs” as they are needed or come up and keep your truck, really besides looks there’s not a “ton” of differences but I understand I also like those 17-19s but my 12 pulls just as well, I would plan for a turbo upgrade in the future as your most likely will go out and you can do the 15+ retro kit, and set aside some cash for a new radiator just in case but other then that miles wise you still have a new truck, that’s my .02