o-a cart

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am building o-a tank cart. Bought some nice noflat wheels that have fit on a 5/8 rod. My question is   ; weld  the rod directly to the back of the uprights, or extend the connection point back several inches as i often see done. would appreciate insights.
Reply:by the laws of physics, the further back you go, the harder it will be to tilt it back. it may not be much, but that's physics. also, the further back you go, the more stable it will be.no matter what you do, keep the wheels up off the ground when the cart is in the "up-right" position, just a 1/4" or so... just don't let them touch the ground unless you intentionally tilt it. this will keep it a little more stable. what size tanks do you plan on using? that may help us get a better image of how large the cart will be, and where we feel the wheels should go.Later,Andy
Reply:thanks, will get some fotos on here. my biggest concern is stability. Base and uprights are heavy,2x1/4 angle . have actually aassembled it with vise grips with wheels down and it still seems pretty stable.
Reply:got enough together to tack the wheels on and go for a ride..there's 40 pound of plate in it  so it doesnt want to tip back, and 3" splices because i made it too short..much better now,, Attached Images
Reply:Wow that should hold it!Me!
Reply:very nice.. are the handles made of EMT/conduit?Later,Andy
Reply:yes, the handles are rigid conduit, wish i had a tubing bender.
Reply:they should be alright i think... what do you have planned for bottle fastening?Later,Andy
Reply:just tack the tank to the crossbar and grind it off when its empty?lolHammack posted a foto recently showing a chain hold down, he said he welded a bolt to one end, gonna use that idea, probably have a wingnut on it for ease of use.one for each tank.what makes the rear-ward  extension of the axle  more stable?
Reply:Originally Posted by weldbeadwhat makes the rear-ward  extension of the axle  more stable?
Reply:the base is 21" x 11", sucker weighs about 75 pounds empty( 13" soft wheels make it actually very easy to tilt and move ,with bottles its gotta be 150 pounds). When i got my first o-a equipment I started with a hand truck with  and  4" hard rubber wheels, a huge pain in the *** to move. this cart is like a ferrari by comparison.It wont tip over as big and heavy as the base is.