I'm looking into the purchase of a trailor mounted unit. I'm wondering what would be the ideal size of a water tank to buy with it 250gal. 350gal. 500gal. I'm not sure. Right now all I have to pull one with is a 03 chevrolet astro van with a v6 engine. I really doubt that it could pull a unit with a full water tank and not blow the trans. out the ying yang. Any suggestions? When considering a means to haul it what vehicle would be best?