Are there more vehicles in the US than guns? This is statistically significant.
There are about 300 million firearms and about 260 million total vehicles (including about 130 million registered passenger vehicles) in America today.
As for guns:347 million, long guns are not registered so couldn't be counted. That’s the 2012 figure. Of those, how many were used to kill? On average there are nearly 13,000 gun homicides a year in the U.S.; that's not considering suicides and accidents. Gun accidents were about 516 people in 2012 and suicides amounted to:21,334.
If people want to kill themselves and no gun is available they'd be finding some other method. There were 42,773 recorded suicides in the U.S. in 2014.
This is by no means to belittle the loss of life but putting the onus strictly on guns is misleading.