I had to take a trailer down the interstate yesterday about 70 miles and did so without trailer lights because there are 3 different styles of fuses on my Ram 2500 pickup and I didn't have a full inventory of fuses in my shop.  Its another of the "WTF were the engineers thinking" when they designed the fuse box!

Local shop had the right fuses this morning and Amazon will be delivering me complete assortments next week.  I probably have spent over $100 on fuse assortments the past few years just to make sure I have what I need for tractors, trucks, pickups, and equipment.