I've made the Bahamas trip many times in my GW. My GW now lives in the Bahamas and apparently it loves it there. First if you're going to the Bahamas you need to get a copy of the "Explorer Charts". They come in a set of three, Near Bahamas, Far Bahamas, Exumas. These are by far the best navigational charts of the Bahamas. If you have a chart plotter that uses CMAP or Garmin then you likely have the "Explorer Charts" already
First trip think about the Abacos. I'd suggest putting in at Ft. Pierce, FL or Palm Beach Inlet, FL. You need to find a place to store your vehicle and trailer. Cross at Memory Rock and keep heading east. Check in at customs at Spanish Cay. Many great places to stay in the Abacos but I will tell you they have gotten more crowded in the last 20 years.
If you're for a little less tourist and better fishing, think about coming down to N. Eleuthera. Again put in at Ft. Pierce or PBI and check in at Customs at West End. Be there when they open. There is a little known route around Grand Bahama and through the Bight of Abaco. This is a little longer but by far the easiest route going to N. Eleuthera. One the way back you may want to run towards Chub and fish the Pocket or Tuna City. This route in in the Explorer charts.
If you've got 2 or 3 weeks, do the Exumas. You'll not be disappointed.
I'm based in Spanish Wells, N. Eleuthera and if I can help I'm happy to.