Why does Rodrick in Diary of a Wimpy Kid spell his van Loded Diaper?

Rodrick in Diary of a Wimpy Kid spells his van "Loded Diaper" because it's a play on words and a joke.

Here's why:

* Loded Diaper sounds like "Loaded Diaper", which is a humorous way to describe a van packed full of stuff, especially if it's messy or chaotic.

* Rodrick's van is often portrayed as being messy and full of junk.

* The misspelling adds to the humor, as it's a silly way to write the word "loaded".

It's a typical example of Rodrick's immature and mischievous personality. He enjoys making fun of things and using silly words to get a laugh.