Labor rates vary, but not so substantially to be as big an impact as property features and tenant quality.  

I use Stessa only for the tracking feature (transactions).

Every system you try will have flaws, or you may salivate over a feature that appears in other software.Some familiar names are mentioned frequently: Stessa, Apartments.com, RentRedi, TenantCloud, Innago, RentManager, Avail, Rentec Direct, Doorloop, etc.I recommend conducting thorough research on each app online to understand their offerings, pricing, etc.

My day job has software that contains a feature that could help with #4 and #5...To post an item the process is to enter it into the search bar and a list of previous items appears. 

This duplex features a large backyard .

Hello, my friend, hemlane is good, but you could also try avail, it has a lot of features as well and, as for me, it's a simpler interface.

A really good episode of the Bigger Pockets Podcast on YouTube recently features an investor specializing in mobile homes. 

Check title records to see if they actually own those properties or have a lease for arbitraging.Use the California Secretary of State's business lookup feature to see if they are in good standing. 

We have a partnership with BP so you can get access to most of the features for free with your BP Pro account.

I just signed up for pro membership and look forward to using it's key features to help me further along in investing.