Description
Review this item in the context of the repair, installation access, nearby parts, and the result the completed job is intended to achieve.
Onsski RV Trailer Jack Blocks – Designed for Stability and Durability
The Onsski RV Trailer Jack Blocks offer unparalleled stability and convenience for RV enthusiasts, campers, and trailer owners. Crafted with high-quality, UV-resistant recycled plastic, these blocks are built to endure harsh outdoor conditions, maintaining their integrity and performance over time. Their innovative magnetic grip ensures a secure attachment to jacks, preventing slips and providing peace of mind during leveling.
With a heavy-duty load capacity, these jack blocks are suitable for a wide range of vehicles, including RVs, motorhomes, and trailers. Their stackable, lightweight design makes them easy to transport and store, perfect for road trips and camping adventures. Additionally, the eco-friendly construction supports sustainability, allowing you to enjoy your travels responsibly.
Elevate your leveling game with Onsski’s RV Trailer Jack Blocks—a reliable and durable solution that combines practicality, stability, and environmental consciousness. Whether you’re parking on uneven ground or stabilizing your setup, trust Onsski to deliver exceptional performance every time.
Joe F. –
These Jack blocks are built quite well. I like how they stack together and won’t twist due to locking tabs between the blocks. They’re sized to fit many sizes, but specifically they fit my Keystone Cougar jacks perfectly. They’re very reasonably priced for what you get.
Jeffrey Picard –
I was a bit surprised with how large these jack blocks are. When stacked together and in the carrying bag they are about the size of a 5 gallon bucket. These fit my tongue jack just fine, but they do not fit my stabilizers. The edge of the pad sits on the rim of the jack block. I could modify them by filling the recessed top of the block with a piece of wood, or maybe cutting out some notches for the pad, but I’ll probably just use one for the tongue and set the other one aside. Quality wise, they are well made and should last a lifetime. I do really love that they are taller than other blocks I’ve had. They will help save a good amount of time when extending and retracting your tongue jack.
Judy Crosby –
dont buy these if you think the online description sounds good. I bought a set and add say magnets attached. WEll….first set came, no magnets, holes are there just not one magnet. So, called amazon, they said they would replace with new ones….WELL….2nd set came….again, no magnets….called amazon, i was told it was up to the shipper…Duh, went by description of what the jack stands were, and they were not…..oh well, guess it is easy to say what should be, take your money and not repeat not what the add says. MY BIT…do not buy if your expecting to be magnatized.
Belt and Suspenders –
These blocks are heavy and heavy duty. They do not have a hand-hold or any edges to grab, so they have to be carried by the bottom edge.The vendor’s photos fairly represent this product. Our pics show one block alone (8” tall) and the two blocks stacked (almost 14” tall). Another shows how the blocks stack. They have notches around the upper edge. Fingers inside one’s bottom edge fit into the other’s notches. The stack feels exceedingly stable.Our jacks have 8” SnapPads attached. They will fit in the top of this block, which is about 10” diameter.The plan for these blocks is that one will stay at home and be used only at home. We will continue to use the current smaller, lighter block when we are on the road. We can leave it in the cargo area when we are at home and won’t have to pack the block at the last minute.Of note… the blocks arrive already in the carrying bag.Rating: very goodMy scale: 5 star = excellent (or has a special feature), 4 star = good/ very good (does what it should), 3 star = average (or has a minor flaw), 2 star = below average (multiple flaws or does not perform its function well), 1 star = avoid (does not fulfill its mission). I rarely use the term ‘perfect’ and I rarely assign 5 stars.
Lee S. –
First things first, misleading to call these “magnetic” as there are no magnets. It is fairly apparent from the design that these are likely a dupe of another product that I have seen that does have magnets since you can see the spots where magnets would go if it had them and it matches up pretty exactly with the other branded product. If they actually had good magnets, they would be a good value, but since they do not, they are quite a bit overpriced. That aside, they are good sturdy jack blocks. They have a little weight to them and unfortunately do not have any kind of handle or rope attached so they are a little clunky to handle. On the plus side, they do come with a storage bag that once you put them in it, makes them a bit easier to store and move around. These have a large enough diameter base and flat top to provide great stability with zero worries about it falling over. These will see much use.
J Kyle –
Wow! What a NICE set of jack blocks. These jack blocks are substantial! They are a large size and feel thick and durable. They have a serious weight load rating. I have a typical travel trailer. I opted to use one of the blocks under my front tongue jack. I typically use the ‘red brand’ rectangle blocks; two of them side by side, usually topped with a couple 4″x4″ wood pieces.This most recent camping trip it was SO EASY to place a single one of these round, substantially sized blocks right under the jack, eliminating having to use all the other stuff. I probably could have used both of them, stacked, as well. A single block is slightly over 8″ in height. I did not get to measure them when stacked.I can see this set of blocks supporting the front legs of a 5th wheel, without a problem. The 2 blocks can stack and they come in a zippered case. I think this set is a good value as compared to the ‘red’ brands.
Bob and Dang’s Journey –
These Onsski RV jack blocks are well-designed and feel quite heavy-duty. They come with a convenient carrying bag and stack together nicely, which helps save on storage space.However, the design of the top surface presented a challenge for our setup affecting functionality. The recessed centerpiece is not ideal for our scissor jacks, as their feet extend beyond the recessed lip. This required us to place a small piece of wood on top to raise the jack and avoid damaging the block’s edge. The advertised “magnetic” feature was also confusing, as we couldn’t determine what it pertained to or how it was meant to be used. It is nice that they can be used stacked though – and this allows them to better handle extreme leveling situations.Due to the top design, these blocks seem best suited for single-post jacks, like a tongue jack or round-foot stabilizers, that would fit neatly within the recessed area.Conclusion:These are solid, heavy-duty blocks, but their utility is limited by the top surface design. They earn 4 stars for their sturdy build, and value , but potential buyers should confirm their jack style is compatible with the recessed top to avoid issues.