I’m currently in the military and have times where I leave the area for extended periods of time.

Are you just renting to snowbirds for longer time periods? 

I transfer this money out after each rent period. 3.

The reason for not doing the refinance immediately after the seasoning period, was due to refinancing and purchasing multiple properties all on the same date (1/4/2021).

My concern is the planned payment date is one pay period from the next payment due date.

There still may be a redemption period there as well.

After owning the home for a period of time and the home continues to appreciate and/or you add value to the home you can do a cash out refinance (depending on rates) or get a home equity line of credit and put this all toward your next purchase.

Unsolicited advice, but consider the tax implications with this.You may be able to take capital gains tax free from your personal residence.If you rent it out for certain period of time that benefit goes away.Consider taking the capital gains to buy separate rental property.Either way, definitely use a PM or Realtor if it's your first rental to get the proper background checks, paperwork, and highest quality tenant.

They are also offering 80% LTV, and there is no seasoning period (all the other banks and credit unions will only give around 70% of purchase price unless owned for 2 years).

I'm helping many people do this exact same thing right now as a Realtor.In my mind, it all comes down to your holding period.