Hi Ronny, I tried to hook up to that address you sent but no luck, so I can't make a constructive comment on those rods. I would strongly recommend sticking with something that you know has the strength and works like Tig or Mig.
Yes! That is our fresh water tank. I had a lot of pictures I took of it and the original before I installed it but I had a hard drive quit on my computer before I got a chance to do a backup lost a whole lot of stuff.
We were getting ready to make a trip and I was filling the tank when I noticed water pouring all over the ground. When I looked underneath the whole backside of the tank was wide open cracks. After 28 years even the exposure from the ultra viloet sunlight broke down the plastic. So I dropped the tank out and tried all over the Internet and various local suppliers to find one. The one company here spin molds poly tanks but wanted about $800 to make a mold. He was not interested in doing a one-off job. The tank measures 4"x16"x42" and holds 10 Imp gals. The existing tank was hung by 4 rusty old bolts to a rotten wood frame with the fiberglass cutout from the rear window as a platfom under it. My only alternative was to fab one out of 1/8"alum. with 1/4" thick disk bosses where the connections are. Having worked in a pulpmill for years I had lots of SS fitting kicking around. I fabbed up a new hanger platform
from 1 1/2" squre alum. tubing and hung it from new 1/2"SS stove bolts. I will take more pictures and post them. It has worked like a charm. I flushed the tank with water & about a teaspoon of bleach before using it. The new tank was approx. $400
So nothing to rust or needs painting
Hope this gives you some direction