Does anybody know of a website or app to determine rental percentages in certain areas?

Look into mobile home investing. 

Is it worth doing a cost segregation study on a Mobile Home Park held in your Self Directed Solo 401(k)?

would like more info. onterested in getting involved in mobile home communities . home prices in my area are the price of the trailer park . makes me curios 

Use things that are turnkey and cost effective: $125/mo is my website, email server, loan application, document portal, calendar scheduling app, all the little pretty bells and whistles that consumers expect you to have, and then you gotta read a book a year ($25/yr) on SEO since that is always changing. $60/mo is the loan origination software. $60/mo is the interest rate comparison software that pulls rates from hundreds of lenders. 

I own some single family rentals and a newly aquired mobile home park. 

I took a trip to tampa to see a mobile home, ended up with mhp for sale.

I have a mobile home park under contract and the lender is requiring more money down than planned.

I've never been able to get the BP app to send popup notifications on my iPhone.

Here are some successful ones.List of Successful Syndicators Joe Fairless - https://www.ashcroftcapital.comIvan Barratt - http://www.barrattassetmanagement.comGrant Cardone - https://cardonecapital.comNeal Bawa and Jean Marc - http://financial-attunement.comKira Golden - https://directsourcewealth.comBrian Burke - https://praxcap.com Tag Birge and Andrew Held - ttps://www.birgeandheld.comBrian Adams - http://www.adamsinvestorgroup.comVinod Chopra - http://moneilinvest.comChad Doty - https://37parallel.comKevin Bupp - https://sunrisecapitalinvestors.com (mobile Home Parks)Scot Meyers - https://selfstorageinvesting.com (Self Storage) Hunter Thompson - https://cashflowconnections.comDevin Elder -http://www.djetexas.comMichael Becker -http://www.spiadvisory.com/