Don, I seem to recall from past posts that you currently have a FWC mounted on your 2006 Tacoma 4 cylinder, 4WD though I don't recall if its a Fleet or an Eagle - shell or regular camper. Your original post mentions "supporting the Fleet" like it is already doing it? Is the 2006 already carrying it?
Cor'ts comments about the TRD package are true, at least in my case. When I had the '99 Type one, 4 cylinder, 5 speed 4WD NO TRD package and the "Flip-Pac It went everywhere I needed to go offroad with no problems, As I've aged the foilks I used to go with have all stopped "wheeling" leaving me to solo explore... still off-road, however mild 4 wheeling...now mostly to the hot springs...or base camping and exploring with the Samurai.
Then there is the resale argument. The perception is if you buy a Tacoma 4WD you need the TRD and the trailer towing package because its a truck and ..."Ta-da-di-da" (drum-roll) a TACOMA. Must work. I depreciate my vehicles. The Acura drops about 10% per year ...The Tacoma 6.1%
Our 2013 Tacoma - V6, aut, 4WD, TRD, Trailer towing pkg now has over 45,000 miles on the original brakes. The Truck/modified Eagle shell rides very well loaded for camping and not to bad when empty. (mounted full time with rear suspension to support 1500 pounds replaced when new and "E" rated tires) . I used the Locking rear once and "played" with the downhill assist couple of times. The trail would have to be really, really steep to get use out of it. Mostly I put it the automatic in low range and first or second gear to stay off the brakes...Works well.
Towing: small trailers, Jet-skii's, currently the Samurai
Brakes: the weight with me in it is at Gross (5,500 pounds...I've lost a little weight). Camping for a week in the desert - 6,200 pounds. This past week (after returning from our 2,120 mile Oregon trip) I had a minor service with my mechanic. Front brakes have 5.5 mm left. Rears (drum) 4 mm. We change the transmission fluid every 15,000 miles (no filter) Just a screen. We manually down-shift to 4th or 3rd coming off freeways and towing using the transmission to slow down the vehicle.
Lastly, we buy new and keep our vehicles at least 10 years. The 99 was 14 years old and in excellent condition at 164,000 miles, when it was sold for $6,000 (paid $18,000 when new)
We would have kept it except with the 4 cylinder and the new Eagle shell there was no performance over 60 miles an hour and dangerous to drive on the freeway, At age 73 this is probably my last truck. When I'm in my 80's and its time to sell it a young man will remember all the hype about TRD and pay me an extra "thousand or two" because its installed - whoopee !!!