If you see future capex expenditures that could hurt the cashflow you're referencing, maybe not. 

Not every park has all of these expenses and some have additional expenses but this is a good starting point.AdvertisingBank Service ChargesDepreciationInsurance: LiabilityInsurance: PropertyInsurance: Workers CompInterest: MortgageLegal and AccountingLicenses and PermitsMaintenance LaborManagement OffsiteManagement OnsiteMowing & LandscapingPostageRent Discounts & IncentivesRepairs: EquipmentRepairs: PropertyReserve for Capital Improvements Supplies: MaintenanceSupplies: OfficeTaxes: PayrollTaxes: PropertyTelephoneTravelUtilities: ElectricUtilities: GasUtilities: TrashUtilities: Water & SewerIn most cases when you review a sales package for a mobile home park for sale it will not mention any reserve for capital expenditures.

Things like borrowing money, capital expenditures in excess of $XX, etc.

Max rent allowable on each at the 1.1% lets me list rent for a condo in the middle reasonably for $638.00/month. there is also a $155.00 condo association fee tacked on the end that I'm not sure can be added to the monthly rent. so the proposed cash flow of each condo per month will roughly be $134.00/unit without even breaking into other expenditures, that is covering a conventional loan of 20% down and 349/month per unit mortgage for 30 years. so with all 4 units as one giant loan package, a conglomerate loan will be for 232,000 with 20% down leaving the mortgage payment of 1195/month for 30 years. tentative cash flow before expenses/mortgages will be 2,552.00 subtracting mortgage and association fee only.

A 3-7 year hold is a relatively short time where I may not experience capital expenditure I has needing to replace a roof or AC unit.6.

I definitely plan on account for vacancy, holding costs, maintenance and capital expenditure costs any turnover costs between residents. 

Is this a reasonable expenditure amount?

I do have a roth IRA with about 6k in it, and something else I can think of is we have a home that we could put the money into making some value-adding improvements (kitchen and updated interior trim mainly) and maybe then use a HELOC or something of that nature.The sole purpose/intended use of this savings would be for real estate, that a portion of it can be used as purchasing power and a portion of it kept as reserves for vacancy, capital expenditures, holding costs, etc.So, my main question, as the post title states: Where would you suggest someone plug their savings into, where it can grow in the short term with the intention of liquidating or accessing it within a year or two and not getting penalized?

If I add a carport to a SFR, I don't think I'd be able to justify the expenditure because it would cost much more than I would likely recoup in rent increases.  

That being said your out-of-pocket capital expenditure increases due to room conversions.