I used to drive a truck for PepsiCo when I did I used an MVP with an aerotank while at work, the battery is huge at 2600 mah, it's rugged and takes a beating, the tank is glass so you can use any juice you want without worry, and at 40 bucks for the mod and 20 for the tank you can't beat it.
Www.101vape.com always has both in stock.
Being a newer vapor I would stay away from mechs until you get a little knowledge on battery safety and such, especially being on the road in the weather. The MVP and vv3 use the same chipset the vv3 is great; only the battery is only 800mah, so you'll want to make sure you can charge it on the road. But, if you're like me that gets old fast, phone and apv both charging drove me nuts, even though the vv3 has pas through so you can use it while it's plugged in. But still; hence, the MVP has a battery 3 times the size and has pass through also. Granted the unit is bigger; but form factor is kind of nice. I know several people, myself and my wife, who have both gotten several other devices but we still use our ole faithfuls from time to time; it actually stays in my wheelchair bag .
Here it is with the aerotank
And this is it with a kayfun/nanokit - not sure if you're using RBAs or not