14 calls in a few days is not bad at all so it seems like you have decent demand.
I would value the park around the neighborhood of:
235 x 47 x 12 x .6 x 10 = $795k for the MHP dirt (40% operating expenses and 10% cap rate)
11 x 5 = $55k for the POH value (maybe slightly more if the homes are newer and in great shape)
So you are about $850k, ballpark, for the MHP part of the deal.
I don't know how to value self storage but whatever that is, add to $850k and you will have a decent idea of the total purchase price.
$1.2MM sounds a bit high to me.