Where are you towing from and where to? That will help decide what precautions you will need to take and what obstacles you may be up against...
So far, what you mentioned is a good start...
Why no cover? Depends on which cover you have though...as some covers will leave markings , others will not but will protect your boat in case of bad weather.
Brings tools, basic necessities like duct tape, electrical tape, wire ties, extra tie downs, etc.
Make sure your tow vehicle and trailer are in good working condition in terms of trans and brakes.
There is a thread on here that someone had asked this question last summer and provided a good listing and discussion of items.
Make sure you have a few TMC members' phone numbers who live in the areas you are traveling in case you get in trouble and need help on the way.