Just listed a spec for sale yesterday so hope to get that under contract before year end.  

Although a spec build or two could be quite rewarding.  

Manufactured homes(think trailer park) are built to HUD specs, while modular are built to IBC/UBC standards. 

It is not a problem for me as for my house I have an inverter, batteries and a generator, and putting in solar panels.

I also have an abundance of detectors of both types, and I hardwired them so no lapses from forgetting to change batteries.

You CAN spend even more money and get battery backup with this mode... so if the power goes out you can have a small amount of energy to run things other than the HVAC or stove... like a medical device.

Emergency Contacts and Guidelines If something needs to be repaired or replaced:Please contact xxxx, LLC by sending a text message to xxxx at 303-xxx-xxxx.If you do not receive a timely response, please also try 303-xxx-xxxx.Fire, medical, or police emergency:If it is an emergency call 911.Please replace batteries in smoke and carbon monoxide detectors as needed and leave them and the fire extinguisher(s) in place.

I also force appreciation with each and every purchase, but my attitude is that if I'm putting that much time, effort, and risk into rehabbing a property from top to bottom to my specs and getting it dialed in and performing with a great long term tenant, then I'm keeping the darn thing, and choosing property that I think will do well with market increases in value and rents over the long term so that the optimal strategy is to keep it.Having said that, I'm not under any delusion that the SoCal market will go straight up all the time, and seeing as how it is a hot market now it would not surprise me one bit if it went down a bit in the not so distant future ... it is of very little consequence to me, though ...

Are there notable benefits to going with the wired option, besides not having to recharge the internal battery every X number of weeks or months?

Rules are good, just make them standard ones that other good landlords are doing.An example of what not to do: don't say you're going to do quarterly inspections (only do inspections every 6 months max and just say it's to change smoke detector batteries and check to see if there are any plumbing leaks and you're in and out in 5 minutes).