1.) Welding: I’m no welder by an stretch of the imagination but there’s a neat light to medium welder that runs on 24 VDC. I first saw it from SnapOn Tools for ~$500. Now it’s available from other folks for less money. What’s neat is the Trace inverters run on 24VDC and so do my vehicles. Just a thought. I did a stairway with it and repaired a cracked alternator bracket and battery support.
2.) 12 Gauge: I’ve been using those neat military shell holders. Each pouch holds 12 shells and has web gear clips in the back. Two pouches on each side, and you’ve got 48 shells handy and available.
3.) Radiac: I have a full set of CD meters and Dosimeters. I also picked up a German Dosimeter set from Steve at Major Surplus N Survival 
For WTSHTF, I also got a Radiacmeter IM-179/U Military Gamma Dose Rate Meter (Issued, Certified) Code: 110449 for heavy radiation conditions. It’s about the size of two packs of cigarettes.
For daily monitoring I have used a DIGILERT 50 for about 6 years now. Runs on a nine volt battery for about 9 or 10 months. It also has the monitoring and recording software available which works great. All available from S.E. International . It reports Alpha, Beta and Gamma radiation. Good high level operation. has digital readout, user adjustable alarm settings, and Total Count mode. There is also pretty sophisticated monitoring software that goes with it. It runs continuously in the background with little load on the computer. Then, of course, I also carry a NukAlert.