/diy/ - Do It Yourself

You and I have very different philosophies and ideas of likely scenarios*, but I hope some of my input is (at least a little) helpful to you.
IDK, about whirleybirds, since you want to be stealth, but something like a couple of solar boat vents should help a lot. Pic related.
>>389133
Is all about upgrading the van's alternator and having a second (isolated) "house" battery. It would charge every time your van's engine was running. IF you were willing to do without A/C, heat and 'fridge, it would more than meet your needs.
* I think you are way off-track by thinking "I NEED A/C and cold drinks", while thinking you can live within the limited space in a van.
I also don't agree with the NEED to implement a failsafe on your power system while being willing to depend on others to provide showers and toilets.
I'm not trying to shoot holes in your plan, but to be blunt, it sounds more like a justification to have a elite tacticool mobile IT van than a reasonable way of avoiding rent.