We've been in some VERY wild weather for thousands of miles, and no water leak.
Line the wheel wells front and back
Remove the ladder screws, squirt the holes full of sealant and replace the screws while it's still tacky.
Remove the outside speakers (depending on if you have them) and reseal around them.
The outside fridge door always gets wet inside. Just get some aluminum tape and make sure it's waterproof inside.
Check the running lights on the roof and douche them well with sealant.
Same with the backup cam.
I'd goop the tops of the awning Mounts.
Check and possibly reseal the side body seam.
I've done none of these, but if worried much, those would be the worry.
Especially the wheel wells.