Trailer hitch and load — Hawaii Permit Test
Trailer hitch and load on the Hawaii permit test — 5 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Use a proper hitch for the size and type of trailer, with special hitches for large trailers, and do not rely on a bumper hitch for any trailer.
A bumper is not built to pull a load, and it can tear loose and drop the trailer on the road.
Don’t rely on bumper hitches for any trailer.
About 10% to 15% of the trailer's weight should rest on the vehicle's trailer hitch.
Load that is set too far back or too far forward makes the car and trailer fight each other at speed.
About 10% to 15% of the trailer weight should be on the vehicle’s trailer hitch.
Too much weight on the hitch makes the vehicle hard to steer, and too little lets the trailer fishtail.
With the front wheels lifted by a heavy hitch, the car does not turn well when you steer.
If the weight is too great, you will have difficulty steering the vehicle.
A trailer must have tail, stop, turn signal and license plate lamps, and side marker lamps and reflectors if required.
A trailer with no lamps of its own hides the car's brake lights and turn signals from the driver behind.
Tail, stop, turn signal, license plate, and, if required, side marker lamps and reflectors.
A trailer's wheels must be properly mounted and lubricated and covered with fenders or mud guards, and its tires must be good and properly inflated.
Bare trailer wheels throw rocks and water straight back into the windshield of the car behind.
Wheels properly mounted and lubricated, and covered with fenders or mud guards.
On the test
Which kind of hitch does the manual say not to rely on for any trailer?
A hitch on the bumper. A bumper is not built to pull a load, and it can tear loose and drop the trailer on the road. State of Hawaii Driver’s Manual, p.88: “Don’t rely on bumper hitches for any trailer.”
How this works
Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.
You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.
Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.
What it costs
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- Do the work, fail the real exam, and we refund you.
Where these come from
Every rule here is checked against State of Hawaii Driver’s Manual, published by the Hawaii Department of Transportation, and against the state code itself. Last checked 2026-10-05.
- src/assets/drivers-manuals/HI.pdf (State of Hawaii Driver’s Manual, 2023, Hawaii Department of Transportation, retrieved 2026-09-14; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/HI.pages.txt (scripts/hi-text.py: PyMuPDF with the clip honored, sorted, hyphens rejoined; the fixture every citation here was cut from and verified against; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/HI-exam.html (County of Maui, Division of Motor Vehicles & Licensing, Class 3 Instructional Permit, https://www.mauicounty.gov/1541/Class-3-Instructional-Permit, read 2026-10-05; states both exam figures; sha256 pinned under examSource)
- https://hidot.hawaii.gov/highways/library/motor-vehicle-safety-office/ (read 2026-10-05; links the manual)
- https://hidot.hawaii.gov/highways/files/2021/08/19-122-std-format.pdf (Hawaii Administrative Rules chapter 19-122, the DOT’s own copy, read 2026-10-05; §19-122-10(f)’s 80 percent agrees with the county’s figures)