You can place it under the tube between the U bolts holding the spring and the axle together, it will take it without leaving a mark. You can even go beyond the inner U bolt if needed, but just a few inches at most. You can bend the axle if you jack it in the middle or close to it, the tube won't crush but it could bend upwards and change the axle alignment.
Once you have the tire off DO NOT go under it at all for any reason.
Now-2014 Sierra 346RETS 5er BUB
Then-2002 Keystone Springdale 286RLDS TT
Nights camped in 2014-28, 2015-127, 2016-10