I would upgrade the trolling motor. Maybe my troubles are due to the weight of the 150, but it just doesn't get the job done on windy days the way I'd prefer. A 65lb Minkota Maxxum would be a "minimum" acceptable motor for me now that I've run the 52 Motorguide awhile. The other option would be a 12/24 system or two 12 volts rigged parallel so that I could run on a "3" or "4" setting all day.
I agree with Marke. If you're using a full size truck, trailer brakes are not necessary.
Spend the money to get a spare tire and mount, but you don't have to go with Tracker components to get this taken care of. At a minimum, buy a spare wheel and tire.
The transom issues have been resolved. The wood's been eliminated beginning with the 2004 model year. The problem was with riveted stern caps being stressed by the weight of the 150. All that is a non-issue now.
Expect to see a 4 or 5 mph difference (lower) between the performance reported by Tracker for the 90 ELPTO 2-stroke and what a GPS will indicate. The standard speedo is worthless for accuracy. My speedometer can show 56, but my GPS will show 50 to 52 depending on the weight of gear, gas and lard butts being hauled around.
If it were me, and you've got the cash, I'd strap a 115 Optimax on that boat.
As for electronics, put a good LCD fishfinder on the bow/trolling motor, and get a good quality handheld GPS with mapping. Beyond that, I'd recommend a cover and...if you are planning to put it into salt water...the galvanized trailer suggested by Marke.
They're great boats. You'll love the ride, the deck space and the amount of storage. (Maybe one day they'll re-offer the dual console option. *sigh*)
MO