What is Reddit's opinion of NSD200A Square D Generator Interlock kit QO and Homeline - Anodized?

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You will need to see if there's an interlock kit made for your service panel, like this:

https://www.amazon.com/SD200A-Square-Generator-Interlock-Homeline/dp/B086Q41H4H

It's a mechanical interlock that prevents the generator input breaker from being on at the same time as your main service panel breaker. If one is available, then you would install the outside generator connection point, run wire to the generator input breaker in your service panel, and you should be good to go. As always, first make sure that everything you want to do is legal in your area, so check with the local permitting agency to make sure. Be sure to get a long enough cord from the generator to the input location so that CO coming in through a window or door with leaky gaskets doesn't happen. That's a fairly common cause of CO poisoning.

Outlets for important stuff like fridges and furnaces, using extension cords, would be super easy but also a bit of a nuisance. What I want is an interlock like https://www.amazon.com/SD200A-Square-Generator-Interlock-Homeline/dp/B086Q41H4H at my main panel, a generator connection box like https://www.amazon.com/X-Haibei-Generator-Outdoor-Receptacle-Locking/dp/B08L8YBCZ5 connected to the normally-locked-out 40a 'generator' breaker, and a cord to connect to the truck https://www.amazon.com/Generator-Extension-N14-50P-SS2-50R-Connectors/dp/B09L8K4F28

When the power goes out, you flip the two breakers at the interlock, plug in the extension cord and have 40 amps of power to power everything you want in your house for days. You'd have to toggle between various 240v loads to make sure you don't go over, but you can run heat, A/C, well or pool pumps, a stove, water heater, etc.

It's a tiny bit more work to do when the power goes out vs what Sunrun will offer automagically, but also much simpler and better IMO.