The other day a load in our washer got piled up on one side so that it saved a huge puddle of water after draining. When it started to spin it made a hell of a racket, and jumped around ! We just redistributed the towels more evenly (big stuff like blankets and towels are more likely to cause this problem), let the puddle drain, and everything was OK after that. Other than that, check if the feet are adjustable -- usually the front feet can be screwed in or out to raise one corner or the other. If you can get the washer really level, that will help some.
Sounds like a fluorescent tube fixture in the bathroom, and that sounds a little larger than the standard size, doesn't it ? That might be an industrial fixture. I'm really surprised Lowe's doesn't have it (not an endorsement, just the only place to buy from around here). You might have to find two shorter ones and join the ends together. Acrylic should be easy to cut to length with a hacksaw, if needed. Just don't rush the job, and it won't crack.
Not an expert on these issues, just spent a lot of time repairing things around this 40+ yo house with a lot of construction "shortcuts" ...
ETA: ditto the vote for LED lights. I am **so** glad to be rid of ballast transformers ! And after a few torn fingernails and bloodied fingers, I can change those fixtures out in a minute. Pull the ballast, save the "tombstone" connectors, connect the bulbs in parallel, and only one end of the LED tube needs connecting -- the other pins are just physical support, so you could jury-rig 36" bulbs into a 48" fixture if need be. Our bulbs have 5yr guarantee, and no costs for ballasts ever again.