I used to live and work in the mountains & upper desert of So. Cal. where out of control fires are pretty much a given every year. I used to help evacuate horses out of the burn and out of the path of the fires. The only thing you can really do at this point is to mark them with identifiers and turn them loose in the event you have to evacuate. If you haven't done it already, put important papers in a safe deposit box or other fire safe. Important papers being deed to the house, vehicles, birth certificates, passports, marriage license or certificate, things that are hard or impossible to replace. If a fire does break out near you then pack a bag for 2-3 days for each member of the household, don't forget any medications that need to be taken regularly. When they come and say to evacuate, preferably while it's still considered voluntary (means more time), then load up the car with your suitcases, kids and hubby if he's home, dogs, cats, whatever you're planning to take with you, and once everything and everyone is in the car, go open the gates and let the animals loose if there is time. Then get out of Dodge and don't come back until it's safe. A house and belongings are just THINGS and can be replaced.
Your plan to just load up on Harley and lead Kodak across the stream or even the river, is romantic and absolutely won't work. It's far too dangerous in a chaotic time like an out of control wildfire. Those things burn hot and fast and create their own wind, including a "Firenado" when conditions are right. They also do things like burn through the crowns of the trees, when a fire is crowning it's moving so fast you don't stand a chance. You just can't take a chance on being on a horse when something like that occurs. And add in, if your hubby isn't home, who's looking after the kids while you're trying to ride a horse out of the fire? Human life, first, last and always, as much as it hurts.
Priority should be given to getting a trailer and vehicle that can haul it. I can't stress that enough. When it was fire season in So Cal, I kept hay, grain, water and feeders & buckets in my trailer, ready to go at all times.
When I did evacuations I carried vials of ACE, Xylazine and Dormosadan with me. If the horses were really freaked out, I'd try to tranq them if there was time, if not and they wouldn't load, I had to leave and go to the next lot that would. That was really hard, to drive away knowing they might not get out. In emergencies like fires & flooding there are usually a lot of volunteers who will come and try to take the animals out and take them to either a designated staging point or somewhere safe and then will call in and tell law enforcement something like, "I pulled a small bay mare, a grey gelding and bay tobiano gelding out from XXXX Rd at ZZZZ Rd and took them to 12345 YYYYY St in AAA Town.", so that owners could call in and track down their animals. During one fire I had 60 horses set up in my arena for a month. People just showed up with pipe panels and feed and would come help tend them. So even if you don't have a set plan, people will come to help.