For most gensets, simply changing the orifice and a few adjustments will allow the conversion.
Here are links with instructios and video:
http://www.thegoodsurvivalist.com/how-to-convert-your-generat ... read more
Depends on the specific type of tub but they can very quickly get over 300lbs.
I have thrown out my back moving them out when they were broken into two pieces so they are not light. Some run as heav ... read more