Getting your rig level and steady usually starts with a solid set of fifth wheel blocks tucked under your landing gear. If you've ever spent a night in an RV that feels like it's floating on a bowl of Jell-O every time someone walks to the kitchen, you know exactly why these things matter. It's one of those small gear choices that seems minor until you're actually out in the field dealing with a slanted campsite or soft, muddy ground.
Most people start out thinking they can just use whatever is lying around—maybe a few scraps of 2x4 or some leftover plywood from a home project. While that works in a pinch, it doesn't take long to realize that dedicated blocks are a way better investment for the long haul. They're designed to handle the massive pressure of a heavy trailer without cracking, rotting, or sliding around when things get slippery.
Why Stability Starts at the Ground
The main reason we use fifth wheel blocks isn't just to keep the jacks clean; it's about physics. When you extend your landing gear or stabilizers all the way out, they become much less rigid. Think of it like holding a heavy weight: it's much easier to hold it close to your chest than it is to hold it at arm's length. By using blocks to bridge the gap between the ground and your jack, you're keeping those legs retracted as much as possible.
Short legs mean less "wiggle." When the legs are tucked in, the whole trailer feels more like a house on a foundation and less like a boat on the water. If you're traveling with kids or pets who are constantly running around, that extra stability is the difference between a relaxing evening and feeling like you're in a minor earthquake every five minutes.
Different Materials for Different Needs
You'll see a few different types of fifth wheel blocks out there, and each has its own vibe. The most common ones are the heavy-duty plastic "Lego" style blocks. They're popular because they're light, they stack easily, and they don't take up much room in your storage bay. However, you have to be careful with the cheaper versions. Under the weight of a massive 15,000-pound fifth wheel, some of those thin plastic blocks can crack or even pancake if the ground underneath isn't perfectly flat.
Then you've got the heavy-duty rubber blocks. These are fantastic because they grip the pavement or gravel like crazy. They're usually made from recycled tires, so they're nearly indestructible. The downside? They are heavy. If you're already worried about your payload capacity, carrying around sixty pounds of rubber blocks might not be your favorite move. But man, do they stay put.
The Wood Debate
Honestly, a lot of old-school campers still swear by wood. A solid 6x6 chunk of pressure-treated lumber is hard to beat for sheer strength. It's cheap, and if you lose one, it's not the end of the world. But wood has its issues. It absorbs water, it gets slimy, and it can attract wood-boring bugs that you definitely don't want hitching a ride into your storage compartments. Plus, over time, wood tends to split right down the middle under the concentrated pressure of a jack foot.
Modern Composite Solutions
Lately, we've seen a rise in these "bucket" style blocks. They're tall, hollowed-out cones or squares made of high-strength plastic or composite. These are great because they provide a huge amount of height in a single piece. You don't have to spend ten minutes stacking little squares; you just toss one under each jack and you're done. They also have a much wider footprint than the standard jack foot, which is a lifesaver when you're parked on grass or sand.
Dealing with Soft and Uneven Ground
We've all been there—you pull into a beautiful "level" spot only to realize the driver's side is sitting in a literal marsh. This is where your fifth wheel blocks really earn their keep. Without them, your landing gear will just slowly sink into the earth. I've seen rigs where the jack foot was buried six inches deep by the time the weekend was over.
The trick is to create a "pad" that distributes the weight. If you're on really soft ground, stacking a few blocks side-by-side before building your tower can help spread that pressure out. It prevents the "cookie cutter" effect where the small metal foot of the jack just slices right through the sod.
Safety and Setup Tips
Setting up shouldn't be stressful, but there are a few things to keep in mind so you don't end up with a mechanical failure. First, always make sure your blocks are centered under the jack. It sounds obvious, but when you're tired and trying to set up in the rain, it's easy to get lazy. If the jack hits the edge of a block, it can cause the block to "kick out" or tip over as the weight transfers. That's a great way to bend a landing leg or drop the nose of your trailer.
Also, try to keep your stacks as level as possible. If you're stacking those interlocking plastic squares, make sure the bottom layer is fully supported by the ground. If there's a big gap under one side of the block, the weight of the fifth wheel will likely snap the plastic the second you put the pressure on it.
Don't Forget the Rear Stabilizers
While the front landing gear does the heavy lifting, the rear stabilizers need some love too. Using fifth wheel blocks in the back is just as important for killing that interior bounce. Even though the rear jacks don't hold the main weight of the trailer, keeping them short and stout helps lock the frame in place. I usually carry a separate, smaller set of blocks just for the rear so I'm not constantly robbing the front pile to get the back end steady.
Maintenance and Storage
The nice thing about most modern blocks is that they don't need much maintenance. A quick spray with a hose to get the mud off is usually all it takes. However, it's worth inspecting them every few trips. Look for stress fractures in plastic blocks or deep gouges in rubber ones. If a block looks like it's starting to fail, toss it. It's not worth risking your rig over a twenty-dollar piece of plastic.
For storage, I'm a big fan of dedicated bins. If you use wooden blocks, keep them in a ventilated area so they can dry out; otherwise, they'll smell like a swamp within a week. For the plastic ones, those mesh bags they often come in are actually pretty great for letting the dirt fall out before you shove them back into your "basement" storage.
Final Thoughts on Choosing the Right Blocks
At the end of the day, the best fifth wheel blocks are the ones you actually feel comfortable using. Some people love the convenience of the magnetic blocks that stay attached to the jack feet, while others prefer the ritual of building a custom stack out of individual pads.
If you do a lot of boondocking on uneven terrain, you'll probably want a mix of different sizes and heights. If you're strictly a paved-pad RV resort type of person, you can get away with a much simpler setup. Just remember that the goal is a stable, level, and safe home base. Investing in a quality set of blocks is one of those "buy once, cry once" situations—you'll be much happier in the long run when your trailer stays exactly where you put it, regardless of the ground underneath.