First thing I see is an easy one: drop comp and collision on your cars. Should shave like $40/mo off your insurance premiums and your emergency fund should be able to cover a replacement car if you are at fault in a crash or it's stolen.
Second, do you really need the Tundra? That's a BIG truck. If you're talking about going badass, an '08 Tundra can probably net you a tidy sum from the sale, save you on tires/insurance/gas, and people will stop asking you to help them move. You said the DH is cycling to work, and since you're a SAHM, you could even commute him on those few days when a. he really can't cycle AND b. you absolutely need the car mid-day.
Other than those two, we're really left with food and the house. Child support is stuck unfortunately. Do you garden? Putting in a big garden could be a help to your food budget. I would start with stuff that's easy to grow and expensive to buy. Herbs especially are super easy to grow yourself and are way overpriced at grocery stores. Lettuce is also easy. We have a line of arugula in our garden that's maybe 1ft wide and 10ft long. It's good for 3 family size salads a week for a month. Plus gardening is fun and gets you outdoors with the kids.
Now, your house payment is high. It's eating up over 1 in 3 of your dollars earned. You just moved in, so I doubt you're gonna consider moving, and I know the Portland area is expensive, but if you're looking at multi-year planning, don't be fixated on this house being where you live forever and ever.