Hard-bottom seat extender ยท Ruff Liners

Ruff Liners Back Seat Extender

A premium extender with a named-vehicle fit list

Updated October 2026

Quick verdict

A premium extender for cars and mid-size SUVs.

Strength
Hard core, 400 lb support, window inserts and a travel bag.
Trade-off
Standard size is not for full-size trucks.
Right buyer
Owners willing to pay for fit and finish.
Material
Heavy Duty P600D Oxford
Prices change often; the button shows today's price.

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Why it matters

The standard extender measures 52.4 x 24.8 x 21.7 in, supports up to 400 lb and adds about 40% more space. Ruff Liners lists fits such as the Tesla Model 3 and Y, RAV4, CR-V and Equinox, and says the standard size does not fit full-size trucks. It includes window inserts, anchor straps and a travel bag, and is machine washable.

Who it's for, and who should skip it

Good fit if

  • Cars and mid-size SUVs
  • Large dogs
  • Owners wanting premium finish

Look elsewhere if

  • Full-size trucks (standard size)
  • Budget buyers
  • Crash restraint

Pros and cons

Pros

  • Named vehicle fits
  • 400 lb support
  • Machine washable

Cons

  • High price
  • Size-specific
  • Blocks rear passengers

Limitations to weigh

  • An extender gives a flat platform; it does not restrain your dog. Pair it with a harness and tether.

Specifications

Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.

MaterialHeavy Duty P600D OxfordRetailer
Features (seller)Door Protection, Machine Washable, Seat Belt Openings, WaterproofRetailer
Model numberRL-MX-V3.3BRetailer
In the boxSeat Cover, Window Inserts, Anchor Straps, Travel bagRetailer

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Final verdict

A polished extender if your vehicle is on its fit list.

Where to buy

Our links open this exact model's product page. Prices and stock change; check what's included before you order.

Prices change often; the button shows today's price.

Each button opens this exact model. We may earn a commission on tracked links; it never changes what we publish. Disclosure

Questions buyers ask

Will the Ruff Liners extender fit a full-size truck?
Not the standard size; Ruff Liners says it is for cars, mid-size SUVs and mid-size trucks.
How much weight does it hold?
Up to 400 lb.