The best jack, the quickest and safest jack, is our built-in Barker VIP 3000. 😎
When upgrading axles, I would not support the hull in any other way. I'm not using jacks on wheels or bottle jacks on a trailer that can move. I added a jack stand underneath before I got under it. If the jacks can do this, they can be used for any maintenance. I had it sitting like this for 4 days by the time I got the old parts out and new axles and leaf springs installed.