Please excuse me if this has been ask too many time, I'm new to this group and still looking around.

I'm looking from some plans for an all terrain welding cart.

I have 3 buildings on a few acres of property and I'm always moving my Millermatic 175 somewhere. I have about 150 feet of "SO" 6/3 cable that I can plug in and get to just about anywhere I need to do work.

Right now I'm using a Harbor Freight "Red Wagon" to move the welder around the property, but it's just not the right tool for the job.

The "Red Wagon" is too narrow and wants to tip over when I'm trying to cross some of the property. It also limits the ability to open the door to make adjustments or change out the wire. I've been using mostly flux core wire since I'm welding outdoors, but I'd like to be able to move the bottle too.
I could also add more features, but right now I need something to move the welder, bottle, and maybe carry the 6/3 extension cord (it's heavy).

The project would be best if it was wide, and low to the ground, but not too wide to fit though a door, or to low not to be able to go over a curb or some rough ground.

I found one for sale; I contacted the people selling it, but never hear a reply.

A second one I found didn't offer any steering, so I'm not sure how well it would work:

Thanks in advance for any help-