Richard,
After giving you situation further consideration, I would not opt for a water delivery from St Pete to Kemah. If you did the water delivery to Kemah, you will have the cost of a captain and mate, fuel, marina expense, food, and transportation expense to get the captain & mate back home. Between New Orleans & Galveston there are thousand of oil platforms off shore and a ton of commercial vessels from oil supply vessels, tows, shrimp boats on the ICW----lots of obstacles and potential liability. You are going to incur the expense of decommissioning and re-commissioning regardless, on the trip from Kemah to Dallas. I would opt to truck it the entire way. The trucking company will bear the liability with their insurance and you will have your boat delivered at Dallas in 2 to 3 days. By the way, the rate per mile for my delivery was just under $3 per mile. One additional bit of advice that the trucker told me was to make sure that the shrouds and stays are removed from the mast completely. An alternative is to allow them to remain on the mast; however, bubble wrap the wires as a group, then shrink wrap the bubble wrapped wires and running rigging to the mast. If you simply shrink wrap the wires to the mast, the vibration during transport will scratch and mar the anodized finish on the mast. Oh, and don't forget to get some 2x4's and splint the jib furler drum and furler extrusion so it is not bouncing at the end of mast during the road trip, possibly bending it. Another cost consideration is that the trucking companies are going to have a "flat rate" for delivery for short distance deliveries. I once considered trucking a boat from Kemah to New Orleans, a distance of only 365 miles; the rate was almost $2000. Compared to the delivery from Charleston to New Orleans, a distance of 1100 miles, I was charged $3000. Of course there are a lot of variables including the current fuel prices that are going to dictate the final cost of trucking. You definitely want to get at least 3 estimates from reputable companies. Also question them about the method of transport. For a 42' boat you want it transported on a dedicated sailboat flatbed that has a separate rack for the mast.