So basically the question I have is what can I charge them for us to clean the house? 

Commissions are negotiated and can be more or less depending on your office policy.Or, again with your managing broker's permission, tell the seller you know several investors that might be interested and get a listing... maybe a limited listing instead of a contract to buy it yourself... maybe as a transaction broker so you're just helping the buyer and seller consummate the sale (not representing either party as a fiduciary) and charge a commission instead of a wholesale fee.Just spit-balling ideas for you, but check with your managing broker to structure something that does work for all of you.

I’ve met commercial loan brokers that charge 2% to setup the deal.

If you havent seen it, I bet you it hasnt happened.I would get your lawyer to file a 30 day notice or whatever your state/county has for a lease that is being ended NOW... 

It only costed me half the charge by doing digging way instead of tunnel way. 

The reputable RV parks that do allow short term rentals, charge a management fee to manage the site since it is assumed you (the owner) are not going to be there very often.

Some even charge for renewing leases. 

I think your estimates on what to charge for rent in Hastings is low.

@Christian Beebe You're saying you spend $150k on average per year with credit cards for expenses on income properties and you're able to pay-off on average 95% of the card balances each month leaving 5% exposed to being charged interest each month

Your best bet is to call around and find one that fits your needs.