Park rules are usually much more restrictive than even houses in HOAs because mobile homes and RVs are close together, and have older residents who are nosy and particular.

I'm always conflicted with whether I should leverage my primary residence for the sake of investment properties.

You may qualify and make it your primary for two years before moving to the next. 

I've reached out to lenders here on Bigger Pockets- but their rates & terms seem high (DSCR or just not good terms)- I qualify for a conventional loan, but my DTI is almost maxed so why pay an extra 2-3% DSCR when I don't have too. 

It depends on the lender but at a min they must follow TX SML or lending laws in the state in order to compliantly lend in TX, on whether choose to apply this guideline to all types of occupancies or transaction types (non owner investment, second homes/primary residences, etc)80-85LTV on rental properties is only on the purchase for fannie/freddie loans but on rate term refinances its max 80% and cash out max 75% for 1 unit and up to 70% for 2-4 unit cash out conventional.On HELOC's and rentals are up to 70-75% depending on the HELOC investor or product.Its good to distinguish between what the lenders are willing to do and for which product and also these loan products must abide my state law as well as an additiona layer of "overlays," on top as well (whichever is worst / most conservative).

Or refinance for spending cash when it come time to retire.The advantage you have living locally is that you can buy a new primary residence every few years and keep the prior home for a rental.Good luck.

Do you take out a second mortgage on an Airbnb that you never wish to sell that’s almost paid off  or do you take out 100 grand against your primary residence.  

This means you’re effectively living for free, or close to it, while building equity in your property.Low-Cost Entry into Real Estate InvestingBecause you're living in the property, you can qualify for owner-occupied financing.

Investment Info:Single-family residence buy & hold investment.

If family lives in the main home and friends stay for free in the garage, the property remains a primary residence, but there’s no rental income or tax benefits.