where do you put your jack

My springs are over the axle, I had a adapter made that fits on the top of my bottle jack and it has a pc of radius pipe welded to it so it spreads out some away from jack post and radius helps keep it on the axle tube. I use it near u-bolts on the axle. They say not to lift on the axle but where do people think the weight of the trailer is...on the axle tube. Your not really lifting the weight of trailer completely as you still have other axle/tire on the ground. Most all of the axle tubes used are at least 1/4" wall and that's pretty darn hard to bend with just the weight of a trailer. I keep my jack just inside the door under the kitchen sink...lol