Or is it only now, that the basement is flooded and they have significant property damage down there, that you are making them aware that there's a French drain on the property and it's on them to keep the inlet and outlet in good condition?

Make sure to properly vet the prospective tenant to ensure you would rent to them under normal circumstances. 

As someone also looking to rent to college kids, I am making sure that all damages are on the heads of the tenant. 

Get a through inspection, I had termite damage in the laundry room that was worse than expected and had to spend a couple thousand dollars to tear down a wall and build back from new.

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???)