Or can I just count the cashflow as income?

Banks are not counting this income yet.  

I’m not sure how long it’s lifetime is and whether or not it can be counted on to cash flow.

The VA will be lifting the V loan limits so if you find a fourplex they may be able to count that income as part of your loan.2.

I have been reading that up to 4 mortgages are easy to get and instead of the total amount on the mortgage the count matters.How would these two compare?

Hopefully your income is relatively high because some lenders will count your HELOC as debt, even if you haven't drawn on it. 20-25% down will get you better terms and more flexibility, plus it forces you to stack cash.

I have been reading that up to 4 mortgages are easy to get and instead of the total amount on the mortgage the count matters.How would these two compare?

If so, then you're not making $140k.What counts as your income is NET income, or rent minus all expenses: mortgage interest, property taxes, insurance, maintenance, repairs, depreciation and more. 

See it all the time where the owner or Workampers hours are not counted and it can be extremely time intensive to manage a park if there are not good systems and maintenance schedules set up. 

Assuming it will be a rental, many lenders will count that differently because it will be tenanted so they won't balk as much at your DTI.