I now request tenants send me a copy showing their final water bill has been paid when they vacate.

While Realtors aren’t required to disclose’non-paying’ tenants, they are required to disclose the names and provide copies of leases.  

Any advice on sending it over signed/ unsigned and how many copies?

You should also look to see if the work you are doing will even require a permit, if the work is cosmetic only and / or only impacts a low sf then you may fall outside of what they even want to see.I'd also dig further in to the submittal requirements to confirm that you need to submit hard copies for the work, many jurisdictions have moved to an online submittal system which makes life way easier. tldr; no unless a professional stamp is required and you are ready to spend a lot of time learning.

They were extremely deceiving with the terms and when I asked if I could have a copy of the contract to review, they refused. 

Don't underestimate techs companies ability to quickly copy each other for the best talent.The future I see for these tech companies/startups is a percentage of employees who are full time remote (20%), as well as more, smaller regional offices combined with HQ in a mega city.

I leave a hard copy of this packet and send them a PDF as well.

Nothing else works.4) Inject a "pride of ownership" into your residents with immaculate common areas and they will take the ball and run with it.5) Don't let city officials push you around -- find a good municipal lawyer and your problems are suddenly solved.6) A successful mobile home park is like a high-density subdivision in which the neighbors watch out for each other and have a strong sense of community.7) NEVER rent mobile homes -- sell them at whatever price you can get and focus STRICTLY on the land rent.8) Smart owners copy what other successful park owners are doing verbatim and bad owners try to be pioneers.9) Think like a lender and you will always be successful (my happiest moment was when I got a conduit loan on Glenhaven as that confirmed that all my steps had been correct).10) Don't listen to your friends, family and peers when you buy a mobile home park as they will all say you're nuts.

@Richard SinghNext time as part of the offer require copies of ALL leases within 24hr of acceptance of offer.

I've found that when utilities are "included with rent", tenants tend to use the utilities pretty freely.