Meguiar's Flagship Cleaner/Wax is very popular and is a good product. I've just started using Protect All which is a carnuba wax based product. I really like the ease of application. I use it in a spray bottle, spreading with a small rag. Then, it wipes off very easily with a dry rag. I used it on my car and truck also and it seems pretty durable.
If you do a search on waxes, you will see lots of responses and comments about wax and decals. Can't help you with cover information as I've never had to use one.
