How long can a storage unit manager hold a personal check for storage payment?

He he charge a late fee while he was holding the checks? Take any adverse action?

What can be done?

Sounds like you have many defenses if he chooses to sue you - but perhaps he's just bluffing. If he does sue you, contact a consumer lawyer to...

While impolite and rude, I don't believe you can do anything on this matter.

What can I do at this point (see below)?

Have you tried going to the DMV with your paperwork? I would start there, as they have a few different ways where they may be able to help you.

Fax and mail to the attorney - do not send to the other party.

Counter-sue landlord for my deposit/treble damages if he's making up "damages," to pay for the cost of remodeling the unit?

Sounds like oyu need to talk with a consumer lawyer. You may indeed have defenses and claims back against him. But make sure you don't miss any...

Can I sue someone for fraud selling me a non working boat when they sent video of it working fine?

You can sue him; but cases like this are difficult and may (as you've stated) be hard to win. Plus you have to decide how much time, money, and...

CAN I SUE A MATTRESS COMPANY. IF THE MATTRESS DID NOT LAST A YEAR.

You "can" sue them. But proving your case and wining could be very difficult and expensive.

Yes, they can sue you. But you may have a number of defenses. Call a debt defense lawyer and get a free consultation.

My car was stolen then towed do I have to pay I don’t have money to get the car out ?

So sorry to hear about your situation. But yes, you will have to pay to get the car out.