What do you do when you cant fish?
Hhhhmmmmm....
I prefer: Women, Jameson Whiskey, riding bikes, and motorcycles. Building things like bikes, motorcycles, kayaks and boats. Making a few sculptures, installing art and other things. Rebuilding engines, boat motors, anything that breaks. Custom fabricating in steel, stainless aluminum and bronze for cash. Though not necessarily in that order.
Honest truth... I hate to say this, but you kinda built your rack wrong.
The deal is that the base is little too narrow.
It's just a matter of leverage, the long extensions to the side increase the leverage and pressure on your welds, base, and mounting points, while the narrow footprint decreases stability. Together it's kind of a problem.
Generally with any kind of overhead rack you want the attachment points as wide as possible even wider then the actual storage area above them. The rack in your last pic is built that way. Or just look at any truck lumber rack to get the idea. Widest stance possible for stability and rigidity with a narrower load area to keep the weight inside the mounting points.
I'm not saying your rack won't work, but keep a couple of things in mind.
The more weight you have on one side the more it will try and pry up the other. So if possible keep the weight toward the center.
If you ever load anything heavy on it like lumber or steel tubing, you want the weight right in the middle right between the legs. Same if you only load one yak. Tie it in the middle not on one side to minimize the pry bar effect.
Hopefully you used some good hardware to mount it because it's going to take some stress, an you might want to use some 4x4 backing plates underneath to increase the strength at the mounting points.
Obviously you have some skill. I teach a lot of people how to weld and I always say the same thing....it's only metal. I'd pull it, cut it back apart then reweld it back together with with the same metal but with some wider supports.
Something like this:
That would be a lot stronger.
If your happy with it and don't overload it, it'll probably be just fine. Just be careful about how much you put up there. Also if you ever lend the truck to anyone makes sure whoever uses it knows that if they use the rack they should not to put all the weight on one side.
Personally I like to make things that are absolutely foolproof. I had a buddy that built a rack that was very similar to that for his jeep and he used it for years, with no problems. Then one day his girlfriend borrowed the jeep, and totally destroyed it in less then thirty minutes with a load of home depot of lumber.
Jim