Leaving TOAD running while pulling

I have a 2007 Chrysler Town and Country which I tow on a dolly and I would like to flat tow. In order to flat tow it would require a Lube Pump but I have been told another option is to leave the van running while pulling. Is anybody doing this when pulling a TOAD? I struggle with the cost of the Remco pump and other goodies to flat tow vs the value of the vehicle! I really want to hear from those that run their toads while pulling. Thanks!