How will they value the land so I can look at LTV and other metrics when modeling my financials?

Its still your debt, though, and it would now be the first mortgage and your new loan would be a second. 

In my experience, cash flow is key, especially for long-term holds, so running a detailed DSCR (Debt Service Coverage Ratio) analysis might be a good step here.On the flip side, if you're eyeing faster returns, a flip might be more lucrative.

@Johnny SmithThere are other ways to reduce your taxes besides real estate.I recommend finding a tax strategist who specializes in real estate taxation, financial planning and tax planning.You may want to consider working with your accountant remotely to expand your options.I would also recommend looking for a accountant willing to work with you throughout the year.

To Mike's point, it can also harm your ability to move on with a new partner who probably will not be thrilled to learn that you're still financially involved with your ex... 

To do delayed financing or a cash out, you can go conventional where you use your debt to income / DTI ratio to finance or you can do a DSCR loan if an investment property.

Now if rents can go to 1,100, different story.Value is based on Net Operating Income, and lending is based on Debt Service Coverage Ratio.Gino

I am hoping to roll these two into one loan and reduce my monthly payment/ interest rate on the HELOC as I will be having the debt long term.I also currently own a 11 spot RV Park which I own all 11 units and is currently generating $10,375/month in rent.

You want an accountant who can help you strategize and who is responsive when you want to know the consequences of the financial decisions you are making throughout the year.There are over 20 real estate accountants on this site.

Conventional loans that use your debt to income / DTI to structure the loan require 12 months seasoning to use the new appraised value for a cash out refinance.