Vandalism and property damage are constant concerns there.Should I continue?

You should always consider apartments as an option for your prospective tenant, because if it costs them more to make payments on a mobile home plus pay the lot rent, they could just rent an apartment instead.

I have two offers: One offer: Deductible: $2,500 general issues and $5,000 for windstrom/hail damages.

Prospective renters have the choice of doing an instant booking or an inquiry.If they don't meet all your requirements then you will have to accept them.

If your friend moved in while you were still there, or got the keys from you and moved in right after you left, then they can probably argue that "you" never moved out, but instead sublet the place without permission.In this case, there's a good chance a judge will say that you do owe the rent (plus any damages), and it'll be on you to go sue the friend for it. 

Photos were recommended in cases of foreclosures or property damage/blight.2) No rescheduling...you will be assigned a day and have to show up (guess there were a lot of no-show's who wanted new appointments???)

One that is typically in a good neighborhood that is extremely run down, outdated, damaged, etc.

They'd leave and could care less they were leaving me holding the bag for their unpaid rent and damages. 

Unfortunately I not able to ask the owner what their motivation is for selling because it's one of those off market wholesale companies that puts out a list to companies then either the public or agents and either prospective buyers either submit an offer sight unseen or they open the property up for a tour on a certain day and submit a bid after that.

What rights do we have for access and showing new prospective tenants around an occupied rental?