I alway travel with a toolbox with what I need to fix anything that can be done away from home.
I replaced the radiator on our maiden voyage with the current camper.
Had the high pressure side power steering hose start squirting fluid on one trip, small crack in it. Mcguyverd that one. Tied it tight with some shop rags, then zip tied the rags as tight as I could. Actually worked!
I always pack zip ties, duct tape and JB weld for limp home fixes.
Fixed a trailer light wiring issue in a walmart parking lot, had to replace the 7 pin connector because it kept tripping fuses.
Changed gear oil in a truck stop parking lot because the rear gears ate themselves and the fluid got hot enough to melt the paint off the diff cover and axle tubes. I only changed the oil because we had another 4 hours to home and I was doing everything I could to get us there. Rear howled all the way home but other than noise it got us there.
That's just the Suburban in my sig. I have tons of stories from other trips and vehicles.
It can happen, just have to be prepared. Not to scare you, I've had plenty of problem free trips as well. I am proactive with fixing and inspecting the truck, but unexpected things do happen. The tricky ones suck in the moment, but make great stories later! :)