I think in the next couple of weeks I'll do the plugs and clean the filter. I'll drop in some injector cleaner at the next fill up too. I'm not due for an oil change for another 2k. So far I have stayed on schedule for all oil changes. Then I will make plans for the other fluids.
I suggest for the spark plugs get the OEM brand/model/part number in the O.M.; if you really want to go with Platinum, get the Double Platinum. You see lots of posts, and for other vehicles with this kind of ignition system, with people swearing they never had a problem with single Platinum plugs and others that stated they used single platinum and 6k miles later they had ignition symptoms and had to change the plugs again. The Double Platinum were designed for this kind of ignition system, the D.I.S. Waste Spark system, where one coil shares 2 spark plugs.
If you're going to change the fluids yourself, its definitely worth going overkill, because you save so much money. Change both axle fluids, change the transfer case fluid and Trans fluid.
Trans fluid & filter may be a challenge, the 3.7L V6 has the Mercedes NAG1/W5A580 Transmission. It doesn't come with a dipstick, and you're suppose to set the fluid level exactly with a chart according to fluid temp and use a special tool dipstick for exact measurement. I got the special tool dipstick for $25 off ebay, I installed a trans temp gauge on my Commander, but I'm sure a good thermometer pressed up against the trans pan for a few minutes would work. The dealer uses their proprietary tool to read what the trans temp sensor says the fluid temp is. I had no problem changing the trans fluid in my NAG1/W5A580, but I'm a lot more exprerienced shade tree mechanic than most people, this is one you might consider having the dealer do. And tell the Dealer to follow the TSB and do NOT flush the trans.
Personally I change PS fluid and Brake fluid at 30k miles on my vehicles, but that is overkill, and only worth it if you save the money doing it yourself.
I do have a trailer hitch but I could not find a wiring harness anywhere on the vehicle. A little bummed about that as the cheapest I found was about $85 on feebay. So far I have only used the hitch for my bike rack.
I don't think any of the V6 Commanders came with a TOW Package, so the TOW rating is pretty low, and probably the reason for NO wire harness. OR the tow hitch was added later.
And that would make me a tad nervous, it would NOT be hard at all to exceed the TOW rating for a V6 Commander and put a lot of extra stress on the vehicle.
Another reason to change the trans fluid, you don't know if the previous owner has cooked the trans fluid in there now, fresh fluid would be a smart move to ensure that trans lasts.