SUMMER 2026 ENGINEERING INTERN

Custom Truck One Source•Union Grove, WI

About The Position

Founded to serve the specialized needs of the commercial truck and equipment industry, Custom Truck One Source has grown into a leading provider of custom-built vehicles, including bucket trucks, dump trucks, cranes, and mobile hydraulic equipment. As an Engineering Intern, you’ll gain hands-on experience designing and supporting innovative solutions for these specialized vehicles and equipment. You will work closely with experienced engineering peers, mentors and managers to develop technical skills in electrical, mechanical, or manufacturing engineering, while contributing to real-world projects that drive our mission of delivering customized, high-quality trucks and equipment. This internship offers a collaborative environment, exposure to industry-leading technologies, and the opportunity to make a meaningful impact on our products and customers.

Requirements

Pursuit of Bachelor’s Degree in Electrical, Electronics, Manufacturing, Mechanical or Aerospace Engineering
Proficiency in 2D and 3D CAD software such as SolidWorks, OnShape, Inventor, AutoCAD, Draftsight, etc
Proficiency in MS Office, specifically Excel and Word
Regular, reliable attendance
Work productively and meet deadlines timely
Communicate and interact effectively and professionally with supervisors, employees, and others individually or in a team environment
Perform work safely and effectively; understand and follow oral and written instructions, including warning signs, equipment use, and other policies
Ability to sit in an office setting and perform computer work
Ability to walk shop floor with workers and see issues firsthand
Operation and review of construction equipment may be occasionally required; proper training will be provided prior to operation if necessary
Only candidates authorized to work in United States without the need for sponsorship will be considered for this position.

Nice To Haves

Knowledge of controls programming
Knowledge and experience with CAN buss
Experience with SolidWorks CAD software
Experience with SolidWorks Electrical Routing
Design software – 2D (AutoCAD preferred)

Responsibilities

Support a variety of engineering tasks with the goal to develop technical, social, and ethical skills
Learn basic principles of Engineering
Work under the guidance of experienced engineers on design projects
Exercise responsible and ethical decision-making regarding company resources and conduct
Schematic creation and maintenance
3D conductor routing and CAD modeling
Creation of harness and pinout drawings
Electrical component sizing, specification, and selection
Troubleshooting electrical issues on a range of products
Providing guidance to shop floor on new installations
Deep understanding of Bill of Material (BOM) structures
Create detail drawings of 3D models (SolidWorks)
Assist technical publications in creation of manuals (parts books, service manuals, operator manuals)
Document designs using 3D solid (SolidWorks and/or OnShape) and 2D drafting software (AutoCAD)
Evaluate weight and balance issues for road worthiness and crane stability
Assist Manufacturing Engineering with development of work orders
Maintain revision control on drawings and other controlled documents
Generate manuals for designed equipment as required
Data entry for Product Data Management system
Create detailed drawings of 3D models (SolidWorks and/or OnShape)
Create sales support drawings
Analyze product failures, develop repairs and redesign accordingly