I've been where you were- not having any idea where and how to jack my camper up. To make matters worse, I had never changed a car tire before attacking my camper like a terrified mad man. I did what you did and posted here:
Jacking up MY fiver (sigh, again)
Let me summarize 11 pages for you:
1) If you have torsion axles, never jack the camper up by the axles. (This had no debate and everyone agreed.)
But, for #2 and #3 - I seemed to get a pretty even split:
2) Never jack on regular axles, you can bend them. Always jack on the frame by putting wood blocks under your jack and then one on top to distribute the weight across the frame.
3) Never jack on the frame, you can damage it. Always jack on the axles as close to the u-bolt hangers as possible
. (Though, resoundingly and without debate- jacking in the middle of the axle was generally considered a terrible idea that could damage the axle. If you want both tires off of the ground, use two jacks - one on each side of the camper.)
The camper manufacturers are strangely silent on this matter. The axle manufacturers advise against jacking on the axle.
4) Use a ramp instead. Look at the Trailer Aid Ramp that is specially made for the purpose. OR, alternatively- make a ramp out of your leveling wood/Lynx blocks so that one tire is suspended in the air.
And finally, if you go for jacking the axle or frame, the debate over what jack to use is also contested:
A) Floor jacks are nicest and safest but not very portable to lug around and are more expensive than floor jacks. This is what I bought for changing my tires at home.
B) Bottle jacks are less expensive and more portable BUT there were warnings to ensure that you had them on level ground before using them. I had concerns over the end of it being such a small diameter and small footprint AND my road is pretty sloped side to side for rain water run off. The bottle jack scared me more than the floor jack (remember- I had *never* changed a tire before).
What I did- I went with the floor jack and jacked the end of the axle nearest the U-bolt because the distance for the ground to the frame was excessive and would have required a significant amount of blocking under the jack to get the jack high enough before I even started lifting the tire. As well, I could get away with a lesser ton-rating jack with lifting just a single tire vs. one side of the camper.
And finally, ensure that the camper is chocked on the side opposite that you're working. I even left the camper hitched to my truck with the e-brake engaged to ensure that it wasn't going anyway. I did NOT want to be the Wicked Witch of the East.