Advice regarding my air tool/compressor needs

One of my issues is that my RV is also my home. Currently I have a storage space nearby, mainly for family keepsakes and for now, my extra tools. However when I hit the road in a month or two the storage space won't be so convenient, hence my desire to have tools with me that can git-r-done. BTW I purchased a torque multiplier and didn't have much luck with it. I talked to the Snap-on tool man about it (I didn't purchase it from him). He said that they're made more for tightening bolts and not for untightening. I just don't know what to believe. He also offered to loan me an air impact wrench, but like a fool I didn't take him up on it.
Steve