For making the Heinz thing, is there any advantage to using 3 or 4" PVC over 2"? Also, what about separation: is 4' better than 2'? I guess this may depend on how wide your trailor is, because I'm thinking of putting the Heinz thing between the hulls on my trailor (I don't have a box yet). <br> <br>Thanks for the help, <br> <br>Paul <br> <br>H20 #714 <br> <br>