Can you use existing Car Jack on your Class B RVs?

I happened to look at the jack on my '01 Dodge Ram 2500. It's got the heavy duty chassis package so it's a pretty heavy unit. The jack under it is the screw type jack. It's stout enough to lift my truck loaded (10500 max GVW with the heavy chassis) so I think the factory on the OP's unit should do okay. These jacks work fine but are a real pain to use.