I just look in my fuse panels...and try to carry each size. (truck & trailer)
Some have other fuses for elec. jacks or other items as well. Good to have spares. Some slide-outs have inline fuses too, just have to figure out where yours may be.
Pete (Jolly Mon)
2014 Jayco Whitehawk 24 RBS
2004 Nissan Titan LE, 4x4