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I would simply drill a small hole at the end of the crack and keep my eye on it.  The problem with welding aluminum is it really weakens any heat treating that was done to the material.  That's one reason why aluminum welds do this, especially just at the edge of the weld.  I really do think it's nothing to worry about, the welds around it appear as good as any of the others I've seen, and the ones that are on my camper.  Now if what you really have is what I saw in your first post, then that's no beuno.

Because it uses very little propane and the recovery time is much less on propane vs electric. 

To get my 3 way fridge out, I had to disassemble it.  Remove the fridge door, and separate the ammonia absorption system from the fridge.  Was pretty easy to do with a cordless drill/screwdriver.  Better than removing the entrance door frame.  Best thing I ever did was toss that absorption fridge and get a household fridge designed to be installed in an enclosed space. 

If you don't rotate the bearings while greasing, then you aren't getting the grease throughout the whole bearing. 

While you are at it, grease the wheel bearings. They can be greased with the wheels on and sitting on the ground, but it is a little easier with them off. Just use a grease gun to squirt grease in the fitting underneath the black sealing cap until it starts to ooze out around the edges.

David

I don't agree with that, it's easier and best to grease with the wheels on and off the ground so you can spin them while greasing.  If you aren't rotating the bearings while shooting grease through the spindle then you risk pushing grease past the rear seal which is bad.