I'll put a 3500 dually on my 9500lb lift any time. But I'm only changing tires or oil. I'm not pulling axles or transmissions or anything like that. If you are concerned just put a screw jack under the front or rear. As long as you know how to set a lift and it ain't rocking when you are doing what ever you need to. Why should there be a problem?
Sent from my Tapatalk using iPhone.
