Running service calls out of your own truck is a different operation than working for someone else. What's in the truck determines whether you can solve the problem in front of you or have to make a supply house run — and every supply house run is time you're not billing.
The Bag vs. The Truck
Separate what you carry into the job from what you stock in the truck. The bag goes on every call. The truck stocks everything you might need. This distinction matters because a heavy bag is slow and a light bag gets you in doors faster.
The Bag — Klein 80028
Wide mouth, rigid structure, carries enough without being a burden. The 28 pieces it comes with form a real working set. This is the bag that goes on every call, into every basement and crawlspace and attic.
Klein Tools 80028 Backpack Set 28pc — the field bag that goes on every call.
View on Amazon ↗Insulated Tools Always in the Bag
Service calls mean panels. Panels mean potential live work. The ACES 14-piece insulated kit lives in the bag permanently — you don't decide job by job whether to bring it. It's there.
ACES Insulated Kit 14pc — IEC 60900, 1000V rated. In the bag on every call.
View on Amazon ↗Power Tools — M18 Platform
On service work you need cordless reliability. The Milwaukee M18 combo gives you a drill and impact driver on the same battery platform. Service work doesn't usually demand maximum torque — it demands reliability and compact size to get into tight spaces.
Milwaukee M18 Drill + Impact Combo Kit — two tools, one battery platform, service-call ready.
View on Amazon ↗Truck Stock Basics
Common breakers in the sizes you'll see most (15A, 20A single and double pole). Common device boxes. Romex 12/2 and 14/2 in small quantities. Common devices — outlets, switches, GFCI. Wire nuts. Tape. Zip ties. Conduit fittings for the sizes you encounter most. Restock weekly. Track what you pull.