ORIGINAL: MatthewVilter
(temperature:)
I can see an argument that vehicles with soft tires make less sense than treads on burning hot planets.
More so I think vehicles on such planets would require heavy and expensive heat dispersal equipment (even more burdensome on hot planets with little or no atmosphere).
Insulation/electric heating on cold planets is not such a huge problem but might still impact infantry loadouts significantly.
(atmosphere toxicity and pressure:)
Aside from the impact on atmospheric survivability (and corresponding effects on unit survivability that we have discussed) atmospheric pressure might impact the costs/availability of heat dispersal equipment and should eventually have a major effect on aircraft design.
(radiation:)
I'm not an expert but I suppose that after hundreds of years filters or other breathing apparatus should provide decent protection against radioactive fallout. In highly saturated areas or on worlds subject to high levels of radiation from their star or, say, the Van Allen belt of their gas giant parent radiation shielding might be necessary. Such shielding might not be much of a burden for a vehicle but the high surface area to volume ratio of infantry means they would be disproportionately impacted.
Thermal:
Keeping something warm is relatively easy, compared to keeping it cold. We know how to keep stuff warm since we tamed the fire. But keeping something purposefully cold? 1850's for Commercial uses. 1920 for Residential uses
In fact, the game currently
ignores heat as a source for Hazard/Issues for anything but open air farming.
I would not worry about tires too much. They are Polymer. A "designable crafting material". We make Rubber for -60°C to +300°C on earth. And the Volcano planet is only ~87°C on the surface.
For Airpressure, again: The Game currently does not track overheating at all.
Radiation is not to be underestimated for Hardware!
In nuclear reactors it is such a huge issue, they can not do direct measurement of stuff like the water level.
Our Mars Rovers use redundant computers, made from radiationa shielded variants of designs that were 10-20 years old when the Rover was launched. And Radiation Degradation of the Solar Panels is a actuall concern (not a big one, but still needed consideration).
If we had realistic Lava Planets or Desert planets with overheating considerd, chances are we would be unable to run
anything but APC, Tanks and Battledress there. Even the Environmental Suit seems to be lighter then a NASA Spacesuit. While those are rated for 150-250°C, that asumes only heating and cooling via thermal radiation (wich means they can happen into different directions). And not for more then a few hours on end.
The suite would have to overcome a temperature gradient of 50°C just on the 87°C planet. That is a massive temperature gradient to overcome, even for a stationary, top loading freezer. Wich are damn efficient.