De aanhanger zit vol verhuisdozen.

In Dutch, zitten is often used in expressions like vol zitten to mean to be full of.

So:

• De aanhanger is vol verhuisdozen sounds unnatural or incomplete.
• De aanhanger zit vol verhuisdozen is the normal idiomatic way to say that the trailer is packed/full of moving boxes.

Even though zitten literally means to sit, Dutch uses it much more broadly than English does. It can describe the position or state of things, even non-human things.

Vol means full.

In the pattern vol zitten + noun, it means to be full of something.

So:

• De aanhanger zit vol verhuisdozen = The trailer is full of moving boxes

This is a very common Dutch structure:

• De kast zit vol boeken = The cupboard is full of books
• De tas zit vol kleren = The bag is full of clothes

Because Dutch does not need a separate word equivalent to English of in this structure.

English says:

• full of moving boxes

Dutch says:

• vol verhuisdozen

So in Dutch, vol can be followed directly by the noun.

You can think of vol zitten as a fixed pattern:

• vol boeken
• vol water
• vol mensen

No extra preposition is needed.

Because verhuisdozen is being used in a general, indefinite sense.

The sentence means the trailer is full of moving boxes in general, not of some specific boxes already identified.

Compare:

• vol verhuisdozen = full of moving boxes
• vol de verhuisdozen = not correct here

Dutch usually leaves out the article in this kind of expression, just like English often does after full of.

Here, aanhanger means trailer.

It can refer to a trailer attached to a car or another vehicle.

Be aware that aanhanger can also mean supporter or follower in other contexts. For example, a political supporter can also be an aanhanger. But in this sentence, because of vol verhuisdozen, the meaning is clearly trailer.

Because aanhanger is a de-word.

In Dutch, every noun has grammatical gender/common article choice, and you usually just have to learn whether a noun takes de or het.

So:

• de aanhanger
• not het aanhanger

There is not always a simple rule you can see from the meaning alone, so it is best to memorize nouns together with their article.

Verhuisdozen is the plural of verhuisdoos, which means moving box or packing box.

It is a compound noun:

• verhuizen = to move house
• doos = box

So:

• verhuisdoos = moving box
• verhuisdozen = moving boxes

Dutch forms compounds very freely, much like English does.

The singular is doos and the plural is dozen.

This is an irregular-looking plural pattern that some Dutch nouns have. It is not as simple as just adding -en to the written singular form, because the stem changes slightly:

• doos → dozen

So:

• een verhuisdoos = a moving box
• twee verhuisdozen = two moving boxes

This is something you mostly learn through exposure and vocabulary study.

No. That is an important difference from English.

Dutch uses zitten with objects and places much more often than English uses sit. It can suggest location, position, containment, or the way something is situated.

Examples:

• Er zit koffie in de mok = There is coffee in the mug
• De sleutel zit in mijn tas = The key is in my bag
• De aanhanger zit vol verhuisdozen = The trailer is full of moving boxes

So do not translate zitten too literally every time.

Yes. This is standard Dutch main-clause word order:

• De aanhanger = subject
• zit = finite verb
• vol verhuisdozen = rest of the predicate

Dutch main clauses usually put the finite verb in second position. Since the subject comes first here, the verb comes right after it.

So the structure is completely normal and natural.

You might hear forms with vol met, and people may understand them, but zit vol verhuisdozen is the most natural and idiomatic version here.

Dutch strongly prefers:

• De aanhanger zit vol verhuisdozen

Using vol met is less elegant here and often sounds less native in this kind of sentence.

Most likely, yes, because verhuisdozen are the boxes people use when moving house.

So the sentence strongly suggests a moving situation:

• the trailer is loaded with boxes for a move

However, grammatically the sentence itself just states what the trailer contains. The moving context comes mainly from the noun verhuisdozen.

The main stress would usually fall on the information that is new or important, often verhuisdozen.

For example, if someone asks what is in the trailer, the natural focus is:

• De aanhanger zit vol verhuisdozen

If the trailer itself is the contrast, then aanhanger could get more emphasis.

The sentence is very natural in everyday spoken Dutch.