Day 9 (12 Feb):
High 20s in the morning, with temperatures dropping after lunch to around -9. Consistent winds in the 20-30 mph range with some stronger gusts.
We got up at 0600 in the morning, took showersgot the bus ready, took the pickup off the trailer (cleaning the windshield, lights, and windows wasn't fun) and ate the hotel breakfast. We took both vehicles about 20 miles, then left the bus near the Visitor Center exit. Within that 20 mile area, there are four National Park Service sites (a minuteman missile silo, a prairie homestead, the National Grasslands visitor center, and the Badlands).
We drove the 5 miles to the visitor center, walked through the museum, and then drove back, stopping at a couple of the trails along the way. We didn't want to take a big delay, but it was too cold with the high winds to stay out very long anyway.
The Badlands were formed when millions of years of sediment were eroded by a river and rainfall in a super-dry climate. Soft layers eroded quickly, and harder layers remained, forming fantastic pillars, columns, and strange-looking sheer hills, caves, and bizarre formations that have to be seen to be believed. Interestingly, a mile from the edge of the badlands, it's just prairie and you can see nothing. Then, when you get to the edge and see a dropoff into miles of twisted earth, it takes your breath away.
Most everything crumbled when you touch it, but unlike other parks that would be destroyed - that's how the Badlands works, continually exposing new rock formations behind the old. It's been forming for 500,000 years and will last about another 500,000 before it all erodes away.

A view of the Badlands - these things never come out quite right in pictures. It is jaw dropping beautiful.

Some of the only vegetation around

A close up of one of the trees (turned sideways in this picture)

We hiked up this draw, near the top of the Badlands in the "sharps."

Loading the pickup back on the trailer afterwards
We got back on the road after about an hour and a half. I would love to spend a week just exploring there, but we needed to get on the road.
However, when we started, we realized the propane heat was out in the bus. I called every propane shop in every town along the route and finally found one open 2-1/2 hours away. It got cold, about 30 degrees inside the bus. My dad looked like a popsicle when he pulled over. For the last hour, we turned on the kerosene heater and brought the temperature up to about the low 60s, but it is deafening loud and we have to breathe the fumes, even with an open window for fresh air.
About a year back, I added a set of mud flaps behind my front tires. However, the one on the propane side tore, and for the last week, the propane tank has been coated with successive layers of muddy ice. It's probably not the preferred technique, but we melted the ice with the kerosene heater in about 20 minutes and cleaned it well enough to fill.
I have a 100-lb tank under the bus and 3x 20-lb tanks. I thought it was all empty and was surprised because I thought I still had another 15 hours or so. It turns out I was right, partially. I forgot to open the valve on one of my 20 lb tanks, and one of my two regulators was frozen up, leaving me half of another tank.
We filled everything up and reconnected all the propane. The furnace still didn't work, so I used the kerosene heater to thaw the regulators. After that, we had heat again. We warmed the inside of the bus to about 55 degrees with the furnace and kerosene heater, then turned the kerosene heater off and started driving again. Altogether, our propane stop took us about 2 hours.

Caked in muddy ice (turned sideways)

Thawing with the kerosene heater
After about 45 minutes, we pulled over, because it was 30 degrees in the bus again. By this time, the outside temperature had dropped to -1. As the driver, I was ok because I had a blanket over my knees with a 1500 watt 5000 btu electric heater (generator powered) under me, with two sets of two warmers in my boots, two fleece caps, silkweight long underwear, medium long underwear, gloves and hand warmers, and a heavy jacket. We figured out the propane furnace was still working, but it wasn't keeping up. We let it warm a little in the bus (stopped buses lose less heat) and then started again.

Driving before the crosswinds got really bad
30 minutes later, visibility was down to about 150 yards with a stiff crosswind that made it extremely difficult to keep a lane. Snow was blowing up from the surrounding countryside, possibly joined by more falling, but the result was that we couldn't see. Worse still, the temperature inside the bus dropped to 17 degrees even with the 40000 btu propane furnace and 5000 BTU electric heater. The ridiculously strong crosswind found every gap in the side of the bus and just blew all the heat right out. A big part of the problem is a bunch of small holes drilled through the floor to anchor the kitchen counters and the couch with metal rods. The rods conduct some heat, but the holes are slightly bigger than the rods and the 30+ mph wind outside turned into a inside breeze through those little holes. The outside temperature was -1.
We pulled into a gas station and got out of the wind. The place quickly filled up with truckers until there was no space left. Out of the wind, and with the assistance of the kerosene heater, we quickly got it warm inside again and ate dinner.
We sat there for two hours or so. We discussed stopping for the night, but I was impatient since we had only gone 250 miles all day. Finally, I turned back on the road. Visibility was good again because the wind was less, perhaps 20 mph inside of 30+, but the temperature was -9 outside. We ran with the kerosene heater going full blast. My water bottle froze solid leaning against the drivers window in minutes.
After about 40 miles, we turned south at Sioux Falls and the crosswind turned into a tail wind. The difference was immediate - probably a 10 degree jump in temperature inside the bus, and the inside breezes mostly stopped.
My dad tried to take a nap, but he was still cold. It was probably 45 degrees in the back, and one of the windows worked open a notch behind the temporary board insulation we're using for this trip, creating a draft. When he came back up, he took another turn at the wheel, and I took a 90-minute nap. I took back over about midnight.
It was a pretty easy drive, with a tailwind and only occasional crosswind. In Omaha, NE, there was a 12-lane highway undergoing construction. The left two lanes and rightmost lane were open, while the three middle lanes going my way were blocked off with barriers. After a few miles of this, with a slight crosswind (the road turned slightly east, so the winds hit at an angle), they added a lane to my right then put up a sign saying that lane was exit only. Ok, sure, I'll still have my one lane...
Then, at the exit, I saw a bunch of barricades right in my lane ahead not far ahead. I slammed on the brakes and swerved into the exit lane just in time to get off. I think there was a path through the barricades, doing a sharp hairpin turn to the left, but I didn't see any signs warning and I didn't have any time to decide what to do.
The exit had no on ramp, and Google Maps put my on city streets all through town until I could finally get back on the highway.
I kept going to Kansas City and spent the rest of the (short) night in a Walmart parking lot, stopping for the night at about 0515.
208081 on the odometer, 667 miles for the day.