I have 2004 Rinker cc coming in april,the boat and trailer weight 5ooolbs.My chev astro has a tow rating of 5400lbs,I installed an external trans and eng oil coolers,and switched all fluids to synthetic.I'm sure the van can pull the boat but I am a little worried about being able to pull the boat out of the water.Has anybody had any experience using this van or weight combinations.THANKS FOR ANY ADVISE.