A very bad idea? (Using trailer landing gear to jack up drive wheels)

I'm just doing a couple of outsides, so I don't need to dangle an entire wheelset and stress the bags too much. I've been getting one wheelset on two 2x4s to get some weight off the other one and not stress the lug bolts, and getting the inner wheel of the other wheelset on a single 2x4. That puts the outer wheel off the ground and easily removed.

 

I kinda don't care who is watching - I'm not easily embarrassed by people that I don't know and will never see again - they're just not real to me. I was mostly just worried about getting in trouble with corporate, and also just wanted to get on the road and not be stuck waiting for help.

 

I already did the two outside wheels just with 2x4s under the insides.

Next project is to switch the steers sometime before winter, definitely will be getting the jack for that job

 

I need me one of those, but manual. Don't have a setup for air tools...

 

Can I use the truck's air with an adapter? Is it high enough PSI for those things?