Brake upgrade reccomendation

My first post, so forgive me if I missed something or jumped protocol. I searched threads and read the FAQ's
I just bought my first TACO. 2006 quad cab TRD PreRunner with 115k miles on it. Other than a little brake flutter, it seems to run as expected.
I plan to use it as a daily driver, also plan to haul a single axle motorcycle trailer (12' x 8') loaded with quads and gear through the desert and the mountains in the summer. All told, I estimate trailer, quads, gear at approx. 3500 lbs. I have the tow package, so I'm safe with the load.
Thank you to Maverick491 for the excellent Bible info btw !
This newbie question is: I would like to do a mild brake upgrade to save my brakes while towing - any recommendations? I'm a little shy on $, so I'd like to keep it under $500. I was thinking the slotted rotors and ceramic pads for the front and not sure if there are upgrades for the rear drums?
Also, is there a accessible plug in the transmission for a temperature sending unit?
Any input greatly appreciated.
Thank you.

 

I'd say for a simple upgrade would be to get slotted rotors with some upgraded pads and call it good.

 

Thanks -

After doing a little researching I decided on the EBC slotted and dimpled rotors with their red pads - $321 plus shipping.

http://ebcrotors.com/p-234-stage-4-signature-brake-kit.aspx?submodel=2WD&submodel2=4.0L, V6&submodel3=Pre-Runner

 

That kit is a little cheaper on Amazon.
282 I believe.

 

You can get a transmission temperature indication by plugging in a Scangauge to your OBD2 port. It will also display other handy stuff like fuel mileage.

 

scangauge can show two tacoma transmission temps....the hot side and cold side. I have both programmed as x-gauge

 

Thank you for all the good info folks. Save $40 bucks going through Amazon as VOZ suggested. Never heard of scanguage - good stuff - Thank you again!

G