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I expect a heavy duty tire with high psi and load, and low speed rating, to have high rolling resistance and high fuel consumption. That's why I thought the LT would be better, not worse! The commercial tires are made to haul a lot more weight than you need... that's the issue. Maybe that is...

Those are < 36". If you are worried about fuel consumption, stick with your original idea of LT... and get tires with low rolling resistance. Size has nothing to do with it.

The only obvious issue I see is where your platform is interfering with the rails.

Probably similar to "you don't need to outrun the bear, you just need to run faster than the slowest person in your group... " So... you need to attract bears less than the other campers at your site.

Low strength steel is actually very good at absorbing energy through permanent deformation. This is a nice feature if you are trying to reduce G forces on occupants, but the steel gets mangled in the process. If we want to reduce damage to the vehicle and the bumper itself for low speed...

38W in a 27mph wind (at low level, not 10m like airports report), just doesn't make sense to bother with...

About 11,000 hrs... yikes! Over 5 years of full time work... Hope you had a great time at Burning Man!

One thing I'm confused about is... can I get the $120/mo plan with the mini if I don't care about in-motion use? If this is merely a power cable, just add the appropriate ends to a long set of wires (12ga 100 ft is <6% loss @ 30W nominal draw) and plug into both devices.

...or 79% holes. 0.24" thick aluminum. $242 and 7 lbs for a 4x8 sheet. How exactly is this used for a floor? https://www.grainger.com/product/Expanded-Sheet-Aluminum-5PAW9

I've never worried about it... but then I stayed away from campgrounds and didn't cook meat (no refrigeration). Black bears that aren't acclimated to humans are afraid of us. Often there were plenty of bears around but they never bothered me.

Mine isn't a topper. I removed the bed and it mounts to the truck frame. It's all fiberglass and carbon layup and PVC foam core. I got the foam from Carbon Core. Aluminum framing is going to create a pretty pronounced thermal bridge, but maybe you don't care about that? And if you toss in...

ACM is usually very thin skin with plastic core. Poor insulation and not very strong or stiff for a sparse frame. Have you considered PP honeycomb and fiberglass skins? This is what the Aterra uses. https://www.carbon-core.com/product/plastic-honeycomb-sheets/ Many angles are good! I'd taper...

If you can't get the weight down to ~8k lbs on the rear axle, then LT tires will be over their weight rating. If you can, then swapping out wheels with LT tires mounted should work. I know some SS manufacturers have an option for LT or military, anyway.

Sounds good to me! I would expect a sway problem since you should be well under the weight rating of the tires. You can fit 12.5s as well, I assume?

When the insulation gets quite good, the ventilation loss becomes an important factor, and a heat exchanger would certainly help. But I think this is probably only practical for someone really trying to minimize heat energy... maybe use only body heat, electric heat, or a very simple heater...

The composite board may have R4/in or so if it's foam + fiberglass like Coosa. The PP honeycomb samples I've seen are sealed in manufacture with air inside; when I got them at 7,000 ft where I live, there was a little bubble above each cell! I don't think they are being evacuated during...

I'm using the lightest PVC foam @ 4 PPCF, which works out to 0.333 PPSF/inch. Check the math. Your skins make these very heavy, with adequately robust panels typically ~1.5 PPSF total, rather than 3+. Have you experimented with thinner aluminum?

I gotta know... about how many hours do you figure you'll have in this before it's finished?

So true...

As other's have said, you will ruin a LiFe battery if you charge it at a significant rate when the battery is below freezing. Discharging is fine at much colder temps. If you will frequently be in much colder temps, it's best to get a battery with a heater built in, and a BMS that will divert...