Condensation biuld up or leaky roof?

I just got my 2017 peterbilt 579 epiq (ex Walmart fleet truck ) I drove it from the lot to the office about 10 miles no problems other then a bad axle seal. I've been camped out at the office a couple days doing paperwork and waiting for my trailer. In this time it has not rained at all had a lil bit of snow. But last night moved it to a different lot and water. Poured out were the cb would be mounted probly 1/2 -1 cups worth didn't drench me but was enough to concern me. It would come out on turns and acceleration. I had pulled the panel off to get a look at were cb would mount so I dunno if wTer was there all along n removing the panel let it run out? Any have problems with condensation building up? The first day I couldn't figure out the apu/bunk heater and it won't let you idle the truck so there was frost on the inside of windshield

 

Thanks for the quick replies everyone. When it goes in for the axle seal they gonna wash it up for me so we'll see if anything gets damp in there. Though the market lights are in the visor not cab. If it's leaking I'll be asking for a diff truck. I've chased roof leaks In campers and rvs. Once they start leaking your fighting a loosing battle.