Flat tire

Not a very good idea, it puts a lot of stress on the frame that it wasn't designed to handle. Get a decent bottle jack, or a Trailer Aid you'd be better off.

They are for stabilizing they won't lift the trailer wheels off the ground. I use a bottle jack to change a tire placed by the tire axle plate.

Only in an emergency such as your jack fails.
Although I do use a bottle jack under the axle (on the U-bolt) and even that is not always recommended.

They are stabilizer JACKs so yes, they will lift - I've done it but only at one end when I was in some soft dirt on the side of the highway and had no choice. I would not want to lift an entire side that way.
Also, if you force them to lift more than they want, the jack screw will bend and it will never be the same.
You should get yourself a bottle jack for these eventualities.

Do you all hook the truck to the camper and raise the front and back jacks before jacking up the camper?

Bottle jack...Jim2007

If I am using a jack I have the front legs down or it is attached to the truck.
I do not use the rear stabilizers as they are not in position or designed to hold much weight.

I prefer my home built ramp using a cut up 2x6. Loosen lugs, run good tire up the ramp, put on spare, you're done. Stabilizers are for...stabilizing...not lifting. Yes, I also carry a bottle jack.

It does not matter if your front legs are down or if you are hooked up to your truck. Mine is sitting on a bottle jack right now as I am doing the brakes.I put the jack under the axle on the bottom of the spring between the u bolts.

Another vote for the Bottle Jack, its the safest way to go. You can get a reasonable priced one at Harbor Freight. Good Luck and Happy Camping !!