Looking for permanent structure over being on wheels to avoid RV parking issues with the city and for the property value add with the permanent structure.

This could be a great cash-flowing asset but you're also assuming a lot more risk with this structure.

As others stated, if the existing structure is legal but non-confirming that should not be an issue.

Whats the best way to structure this?

You could run into issues down the line without one, depending on your business structure.  

However, for longer-term profitability, flexible loan terms often have a bigger impact, especially with interest rates or repayment structures that align with your goals.

Clearly this structure has been discussed amongst prospective partners since "Mike the builder" has instructed the parties how the purchase agreement should be papered.  

Discuss this with the lender before proceeding.Partnership or Joint Venture:Structure the purchase with a partner or entity while maintaining the assumption in your name.This allows you to benefit from the entity's structure while complying with VA loan rules.Entity-Owned Financing:If assuming the VA loan isn’t feasible, explore refinancing into a non-VA loan owned by your entity after the property is acquired.4.

You can structure your home with an LLC, or even invest with multiple people.Peace of Mind: 1-Yr Rent Guarantee: We guarantee rent for the first year, so no matter what you will receive your rental payments uninterrupted and you’ll be making money from day one.

If so it might be hard to sell the management side of the business as the the real estate sales may be also under the same company structure.