As a retired mechanic I have waaaay too many tools in our truck. I am continually trying to carry less tools. You need a few 1/2 inch tools to remove the hot water heater drain plug and deal with the lug nuts. A tourque wrench. A good voltmeter is handy as well as a refracometer to check battery specific gravity. A small 1/4 inch and 3/8 inch socket set can be handy as well. An electrical connector repair kit is a good thing too. 12 volt test light and electrical tape is handy as well. Oh, I almost forgot, a grease gun to lube the dexter axles.
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