I found video footage of police searching vehicle, in which you can clearly make out the molotovs stowed in the back:
http://www.kirotv.com/videos/news/raw-video-arson-bomb-squad-at-seattle-suspect/v5tgp/
Also, he apparently is a fan of the DARE anti-drug program.
NOTE The following text is a quote:
spdblotter.seattle.gov/2013/07/04/uwpd-spd-fbi-investigating-nevada-man-arrested-with-armor-guns-and-incendiaries/
UWPD, SPD, FBI Investigating Nevada Man Arrested With Armor, Guns And Incendiaries
Written by Sergeant Sean Whitcomb on July 4, 2013
At 10:30 p.m. on Wednesday, July 3, 2013, officers from the University of Washington Police Department observed a pickup truck on campus that was reported stolen out of the State of Montana. Officers conducted a high-risk traffic stop on the truck in the 3400 block of Sand Point Way NE. Officers took the driver of the truck, a Nevada resident, into custody without incident and booked him into King County Jail.
A subsequent search of the truck revealed a stolen scoped rifle, stolen shotgun, suspected incendiary devices and body armor. University of Washington police requested assistance from the Seattle Police Department and the Federal Bureau of Investigation, which have joined the investigation.
At this point, there does not appear to be any threat to the University of Washington Community. This is an on-going criminal investigation.