Hey Brendon,We have a small campground we built so hopefully I can offer a little help until others contribute.Lots of things determine the construction cost and not being from your desired location handicaps me.That being said maybe I can at least shed some light on your idea.Things that will determine actual per lot cost are power,sewer and water.1-Underground power is the way to go,more cost but more spaces because of overhead clearance restrictions.2-Available sewer also is best but septic systems work fine but cost more and chew up land area and require more long term maintenance (we have septic systems,3 spaces per system). 3- Water,there again country,or city water is best but a well and your own systems works fine also just requires more upkeep.As far as the park itself it's best to (IMO).1-set park up with three sections to accommodate different styles of campers,over night,seasonal and annual (if area warrants),all three have there pros and cons,overnight area is cheapest to construct since you'll just have bathhouse ( no septic,power or water per site). seasonal spaces will be completely developed but will rent for highest amt because it's short term (usually power is included into rate).Last is annual which again lots are fully developed but not so much in and out and consistent cash  flow,tenants put utilities in there name as they would a SFR. 

However, if you spending $499 will help propel you to the next level then more power to you.

This is why the BRRRR strategy is so powerful, it has the ability in the cash out refi, to give you cash for your next deal built into it.  

By doing so, you will continue towards your economy of scale more positive cash flows over time add up to purchasing power for other properties.

Also,, If your Mother is the trustee, of the trust she has major power, she can choose how to do quite a lot with the property, So that could be good news for you..If Your mom is the executor of the Will, she is limited to the verbage in the will and has to adhere to the dispersal of the property per state law after probate had been closed.

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Hello everyone my name is Rand.I currently own a 1.5 Acre empty commercial lot in SoCal  and was approached with the idea of utilizing it with solar panels (selling power to Edison?)