Once you’ve decided on a trailer hitch cover, the next question trips up almost everyone: which size do you actually need? The Interchangeable Hitch Cover® from The Hitch Cover Company comes in two standard options, 3″ x 6″ and 6″ x 12″, and they aren’t just different sizes of the same thing. They serve genuinely different purposes depending on your vehicle and what you’re trying to display.
What the Numbers Actually Mean
Both sizes describe the dimensions of the plate or graphic itself, not the mounting hardware. A 6″ x 12″ display matches the size of a standard U.S. license plate, which is why it’s the more common choice: it’s built to hold real plate-style designs, sports team plates, novelty plates, and full-size vinyl graphics, at a size people immediately recognize.
A 3″ x 6″ display is exactly half the width, a smaller format originally designed for compact placements or a more subtle statement. It holds smaller graphics, mini plates, or designs scaled specifically for that footprint rather than a shrunk-down version of a 6×12 image.
Vehicle Size Isn’t Actually the Deciding Factor
This is the most common misconception. People assume a smaller car needs the smaller 3×6 size and a bigger truck needs the 6×12. In reality, hitch receiver size is standardized regardless of vehicle size, both the 1-1/4 inch and 2-inch receiver classes show up across sedans, SUVs, and trucks depending on towing capacity and factory equipment, not vehicle size alone. The display size you choose is really about presentation preference, not what will physically fit your receiver.
When 6″ x 12″ Makes More Sense
For most buyers, 6×12 is the practical default. It matches real license plate proportions, so the huge majority of officially licensed sports team plates, novelty plate designs, and pre-made graphics are produced in this size. If you want maximum visibility and the widest selection of ready-made designs, 6×12 is where nearly the entire product catalog lives.
When 3″ x 6″ Makes More Sense
The smaller format tends to appeal to a more specific use case: drivers who want a subtler statement, a smaller decorative touch rather than a full plate-style display, or those working with a tighter mounting space where a full 6×12 footprint feels like too much. It’s also a common choice for a second, complementary display alongside a primary 6×12 plate, layering a smaller design without crowding the main one.
Receiver Compatibility Matters More Than Display Size
The detail that actually determines fit isn’t the plate size at all, it’s the receiver insert. A properly designed trailer hitch cover includes inserts compatible with both common receiver classes, 1-1/4 inch and 2-inch, so the mounting hardware itself adapts to your vehicle’s actual hitch regardless of which display size you choose. Checking your receiver class before ordering matters far more than guessing based on how big your vehicle looks.
Can You Use Both Sizes?
Yes, and a fair number of buyers eventually do. Since the two sizes serve different display purposes rather than being scaled versions of each other, some owners run a 6×12 plate as their primary display and add a 3×6 as a secondary accent, either on the same vehicle in a different mounting position or across two different vehicles in the household.
Making the Decision
If you’re only getting one display and want maximum design selection and visibility, 6×12 is the safer default for most people. If you specifically want a smaller, understated look or you’re working with limited mounting space, 3×6 is worth considering instead. Either way, the size decision comes down to presentation, not vehicle fit, since the receiver hardware adapts to your hitch regardless of which display size sits on top of it.
FAQs
Does a bigger truck need the 6×12 size and a smaller car need the 3×6?
No. Hitch receiver size depends on towing class, not vehicle size, so both display sizes can fit vehicles of any size. The choice comes down to presentation preference.
Which size has more design options available?
6″ x 12″ has the widest selection by far, since it matches standard license plate dimensions and is the format most officially licensed designs are produced in.
Can I use a 3×6 and 6×12 display at the same time?
Yes, some owners use a 6×12 as their primary display and a 3×6 as a secondary accent, either on the same vehicle or a second vehicle.
How do I know which hitch receiver class my vehicle has?
Check your owner’s manual or measure the receiver tube opening directly. Most vehicles use either a 1-1/4 inch or 2-inch receiver, and a properly designed hitch cover includes inserts for both.