RV Tire Covers: I believe these are important if you're parked more than a few days with the sun (especially desert sun) beating on your tires. That sun does more to age your tires than driving, and the covers will protect them from UV damage and premature cracking of the sidewalls. Purchase the correct ones for your tire size.
I like the rv tire covers that have some elastic to keep them in place on windy days - they are far easier to put on and take off than the ones with bungee cord things that go from one side of the cover, around the back of the tire and hook on the other side. If there is an easy way to get that done, I never discovered it - getting them hooked up is really tough on the knees and lower back.
There seems to be a fair amount of disagreement as to whether rv tire covers are necessary. Some say they are not, unless you're at elevations above 3000' or so. Since I spent a good deal of time in the Southwest I felt they were a good idea. There are also UV protectant sprays you can get for the tires.
RV Cover: Do you store your rv outside for part of the year? If you do, consider purchasing an RV cover based on the part of the country the rv is stored. The manufacturers say these products will protect the RV's finish against wind-blown dust, UV radiation, the insult of bird droppings and will keep your stored rig cooler. Some covers will keep rain off while allowing built-up humidity to escape should you happen to live in an humid area of the country. Although rv covers can cost a pretty penny they are far less expensive than a storage building large enough for an RV would be, so the price is attractive for those who want to store their RV and keep it protected.
Some users complain of the difficulty of getting the cover on since you generally have to climb up on the roof to do so. Stepping around on the cover, on the roof of your rig, can lead to broken roof vents or body parts. And the cover is pretty heavy to work with.
If you decide to get a cover for your rv, the best recommendation is to pay the extra to get one custom-designed for your rig. That way, the opening for the door will be in the right place, so you can get in and out without removing part of the cover.
A good cover will cost in the $300-$500 range and will last about two years.
Tow-car glass protector: you can buy a vinyl windshield protector for your dinghy to protect it from scratches or nicks caused by flying rocks or sand. Wish I’d known that when I started.
Dirt Skirts/Mud Flaps: Here is another item I wish I had thought of before taking my first long trip.
There are various kinds of “skirts” that can be attached at the rear of your motor home to keep gravel and rocks from flying up from the rear wheels and hitting the front of your towed vehicle. My poor dinghy got its front bumper, and even the hood, all nicked and battered – it will never be the same again!
The dirt skirt I had installed is the brush style and seems to do a good job. Several people have mentioned liking the Rock Tamers, an adjustable and removable mud flap system to protect whatever you are towing.
RV Mask: This is also called a “bra” and you can find them for the front of your towed vehicle as well. It will protect the front of your motor home or car against nicks and scratches from bugs, gravel and debris. I don’t have one of these and don’t think they are available for every make and model, but if you can find one, or have one custom-made for your rig, it may be worth the investment.
I've heard that it's important that the bra should fit tightly; a poor fit can actually rub the clear coat off your paint. It's also recommended that, if the felt backing becomes wet, you remove the bra to let it dry.
Another solution is the RV spray on and peel off mask by Armor All or a product called Plasti-Dip. These apparently come in clear, gray, or black and it isn't recommended to keep it on for more than a year.
Extra Propane Tank:
It is so easy to take a small propane tank in your car to get it refilled. I actually have two of these "twenty pounders." It is a big deal to unhook everything in order to take your rv to get its bigger tank refilled, and then have go through hooking it all up again when you get back. My motto is to keep things simple whenever possible!
As you can see, there is no end to the extra equipment you could get for your motorhome - rv tire covers is just the start. Is it all really necessary? You'll have to do your research - and the best way to do that is to talk with other RVers - then decide for yourself.
You can find almost any RV parts and accessories you need at Amazon.com