My hope is to have some longevity, and by doing it this way I can pace myself.

Longevity to you all!

With just 10 to 20 of those driving around, It would seem to me like a great lead source and would certainly have more longevity than bandit signs.

Protect yourself by making sure you go with a company that has individual qualified escrow accounts that require YOUR signature to release funds, check references, look for longevity, Find out who the owners are, Is the company a member of the FEA, BBB, Do they have certified Exchange Specialists on staff, Do you get a real person when you call?

The brick has a lot of advantages (fire, longevity) but I personally think A Frames are solid investments too.

Longevity (Will this still be a good property in 5 years)

Longevity is the key to selecting a good PM company.

Lease price, structure, length and longevity of the current tenantsCondition of the capex items including the roof, structure, water tank, furnace, ac, appliances etc. 

What are everyone's opinions on the longevity and sustainability of this significant surge in activity within this market.

The purpose of keeping the d properties is because most of my tenants are either on social Security or disability and have long longevity since they were inherited tenants.