Below are highly regarded commercial-vehicle insurance brokers and brokerages in the United States, organized by the needs they best serve (national/global capability, transportation/trucking specialists, and digital/small‑business options). I’ve included short notes about why each is often recommended and citations so you can read more.

Top national / global brokers (best for large fleets, complex programs, national & international placements)

• Marsh McLennan — market leader for large corporate and transportation programs; strong transportation & trucking practice. (insurancebusinessmag.com, marshmma.com)
• Aon — one of the world’s largest brokers with broad commercial auto and fleet risk solutions. (insurancebusinessmag.com)
• Arthur J. Gallagher (Gallagher) — large global broker with strong P&C and fleet capabilities. (insurancebusinessmag.com, reuters.com)
• Willis Towers Watson (WTW) — big global advisory and broking capabilities for transportation and fleets. (insurancebusinessmag.com, investopedia.com)
• Lockton — large privately held broker known for client-focused programs and specialty placement ability. (insurancebusinessmag.com, en.wikipedia.org)

National/regional brokers with strong commercial auto/fleet practices

• HUB International — large U.S./North America broker with dedicated commercial auto & fleet platforms and digital fleet marketplace. Good for mid‑size to large fleets. (insurancebusinessmag.com, hubinternational.com)
• Brown & Brown — large national broker with program and retail distribution for commercial auto. (insurancebusinessmag.com)
• Alliant Insurance Services — national broker with specialty transportation and fleet offerings. (insurancebusinessmag.com)

Transportation / trucking specialists (best for owner‑operators, for‑hire fleets, freight brokers)

• Reliance Partners — specialty agency focused on trucking/transportation (owner‑operators through large fleets), strong market access and trucking program expertise. (reliancepartners.com)
• Other specialty brokers/program managers — many regional agencies focus on truckers (motor truck cargo, trucking liability, cross‑border cover) — large national brokers above also operate dedicated trucking teams. (hubinternational.com, marsh.com)

Digital brokers / marketplaces & insurtechs (best for small businesses, single vehicles, food trucks, small fleets)

• Insureon (part of HUB/SPG) — digital marketplace for small‑business commercial insurance (compare multiple carriers online). Good for small fleets/delivery, contractors. (insureon.com, prnewswire.com)
• Embroker — digital/commercial broker for small‑to‑mid businesses, with online quoting and tailored programs (includes commercial auto). (embroker.com)

How to choose the right broker (quick checklist)

• Match specialization: pick a broker with trucking/transportation expertise if you run trucks or a carrier; pick a national broker for multi‑state or cross‑border exposure. (marshmma.com, reliancepartners.com)
• Ask for referrals, carrier panels, claims advocacy and loss‑control services; confirm they can place MCS‑90, motor truck cargo, and other trucking endorsements you need. (hubinternational.com)
• Compare 2–3 brokers: get written proposals, request the same coverages and limits, and review fees/commissions. (hubinternational.com)

What to have ready when you contact brokers

• Vehicle list (VINs, model years), driver roster and MVRs, 3–5 years of loss runs/claims history, annual mileage, vehicle uses/routes, and any DOT/CSA records. Brokers will ask for these to quote accurately. (hubinternational.com)

If you want: tell me (a) whether this is a single vehicle, small fleet (2–25 vehicles), or large fleet (25+), and (b) the state(s) you operate in, and I’ll shortlist 3–4 brokers (including one local/specialist and one digital option) and give links to their commercial‑auto/trucking pages.