If this alleged New Jersey neo-Nazi hadn’t wrecked his car last month, he could still be living under the radar — with a massive arsenal of weapons and white supremacist propaganda, authorities said Tuesday.

Joseph Rubino, 57, crashed his car July 24 and the New Jersey State Police officers responding noticed something unusual while “extracting [him] from the motor vehicle in order to render medical treatment,” according to a criminal complaint filed in New Jersey federal court.

Cops spotted a cache of firearms and ammunition, including a semi-automatic assault handgun, a 9mm semi-automatic assault pistol with a high-capacity magazine, a loaded 9mm pistol, a high-capacity magazine with 12 bullets, a wooden club and a baseball bat, the complaint states.

Later, when searching his Sussex County home, police said they found dozens of other weapons, including assault-style rifles, a grenade launcher and ballistics vest.

They also found a box of clothing and bumper stickers with “SS Bolts,” a neo-Nazi symbol, sometimes used by motorcycle gangs — and a racist document titled “[N-word] Owner’s Manual,” which prosecutors said seemed like “an instruction manual for owning a slave.”

Authorities also said they found 70 grams of methamphetamine, more than 6 pounds of marijuana and 200 weed vape cartridges.

Rubino, 57, was charged with possession with intent to distribute methamphetamine, possession of firearms in furtherance of a drug trafficking crime, and possession of firearms by a convicted felon, US Attorney Craig Carpenito announced Tuesday.

The later charge stems from a 1999 conviction in Sussex County Superior Court for writing bad checks, according to the complaint.

Rubino faces life in prison if convicted of drug trafficking, the most serious charge.

He was due to make his initial court appearance in Newark Tuesday, but that hearing was later postponed.

Prosecutors said many of the firearms and ammo found in Rubino’s house and car were manufactured outside New Jersey.