[TheForge] Inverters & MIG Welders

[Washington, Aubrey O.]

Now that I've got my 115V MIG welder ordered (Millermatic 140), I have another related line of questions for the group.
 
I have a new Toyota Tacoma with the 130A alternator on it.  I've been considering installing a power inverter on the truck so I can run power tools, etc.  Here are my questions:
 
Are there any cautions or dangers involved in installing or using inverters?  Can they damage my truck's electrical system in any way?
Inverters come in lots of different wattages.  Is bigger always better?  
Is it practical to consider running the MIG welder off the inverter?
 
Thanks for any advice or information.
 
Aubrey