You’ll want to make sure the rental income comfortably covers the new mortgage, taxes, insurance, and any maintenance costs.

Ensure the STR’s projected income comfortably covers new debt, even with conservative occupancy rates, and maintain reserves for market changes or vacancies.

I have 2 large cabins (2,000 and 2,500 sq ft) I'm holding and another 2 bed 1,500 sq ft cabin just about done and another two that are under construction for holds.

Covers all aspects of marketing self storage.  

Possibly as an incentive you cover anything over a certain amount to give peace of mind to the renters.

My priority is getting as close to cash flowing as possible with minimum investment on a 4 beds 2 baths but I'm also thinking about appreciation because you never know when you'll have to sell...

Mainly I’m trying to avoid “aged poorly design” glassblock walls, small bedrooms, older windows (wood/aluminum, single pane), aluminum patio covers, and to a lesser extent landscaping.

What service or value are we providing that it covers?

I've used it as a reference point, the reason being is that the 70% rule doesn't cover the amount of time it could take.How we buy properties is what is our cash on cash return?

Umbrella insurance is crazy cheap for the benefit, and it already requires you max out your liability on your other covered items.