rigsize

Grand Design Momentum 388M mattress size

Years 2015–2018Sold as MomentumLength 41' 9"
60 in 80 in
To scale. Dashed: a regular queen.
Main bed60 × 80 inQueen

That's the same size as a regular queen, so any standard queen mattress fits.

About the RV queen size →

Grand Design spec sheet, 2018.

Mattresses in 60 × 80 in

We may earn a commission when you buy through some of these links. It doesn't change which mattresses we list.

Great all around
RVMattress.com Signature Hybrid

RVMattress.comSignature Hybrid

  • Hybrid
  • 13.25 in thick
  • Soft / Medium / Firm

Sleep Foundation: Best Mattress Overall Read review

$1,465Queen · list priceSee price
Best value
RVMattress.com CopperFlex Essential

RVMattress.comCopperFlex Essential

  • All-foam
  • 6 in thick
  • five comfort options
$524Queen · list priceSee price
Firm
RVMattress.com Plank Firm Luxe

RVMattress.comPlank Firm Luxe

  • Hybrid
  • 13 in thick
  • Firm / Extra Firm
$1,598Queen · list priceSee price
Cooling
RVMattress.com Aurora Luxe Cooling

RVMattress.comAurora Luxe Cooling

  • Hybrid
  • 13.25 in thick
  • Soft / Medium / Firm

Sleep Foundation: Best Mattress for Temperature Regulation Read review

$1,999Queen · list priceSee price
Heavy duty
RVMattress.com Titan Plus Luxe

RVMattress.comTitan Plus Luxe

  • Hybrid
  • 13 in thick
  • Plush
$1,665Queen · list priceSee price
Helix pick
Helix Helix Midnight

HelixHelix Midnight

  • Hybrid
  • 11.5 in thick
  • Medium Feel

Sleep Foundation: Best Mattress for Side Sleepers Read review

$1,183Queen · list priceSee price
RV hybrid
RVMattress.com CopperFlex RV Hybrid

RVMattress.comCopperFlex RV Hybrid

  • Hybrid
  • 10 in thick
  • Medium-Firm
$799Queen · list priceSee price
Custom size
Mattress Insider Luxury Gel Memory Foam

Mattress InsiderLuxury Gel Memory Foam

  • Memory foam
  • 8 in thick
  • not stated
Made to 60 × 80 inGet a quote
Bedroom in a Momentum

The Momentum bedroom. Measure the platform, not the old mattress, before you buy.

Bed sizes by year

YearMain bedBunksOther bedsSource
201760 × 80 in Queen––Grand Design spec sheet
201860 × 80 in Queen––Grand Design spec sheet

Years not listed weren't published.

Is this your 388M?

Check the year and length against your RV before you order.

YearModelLengthSleeps
2015Momentum 388M41' 9"–
2016Momentum 388M41'9"–
2017Momentum 388M41' 9"–
2018Momentum 388M41' 9"–

Other Momentum mattress sizes

327M328M348M350M351M354M355TH376THAll Momentum floorplans

Sources

  1. Grand Design (granddesignrv.com), archived copy: https://web.archive.org/web/20150509175939/http://www.granddesignrv.com:80/momentum-specs.php
  2. Grand Design (granddesignrv.com), archived copy: https://web.archive.org/web/20160402211848/http://www.granddesignrv.com:80/momentum-specs.php
  3. Grand Design (granddesignrv.com), archived copy: https://web.archive.org/web/20160610041149/http://www.granddesignrv.com:80/showroom/2017/toy-hauler/momentum/floorplans/388m
  4. Grand Design (granddesignrv.com), archived copy: https://web.archive.org/web/20170201002216/https://www.granddesignrv.com/showroom/2017/toy-hauler/momentum/specs
  5. Grand Design (granddesignrv.com), archived copy: https://web.archive.org/web/20191021221605/https://www.granddesignrv.com/showroom/2018/toy-hauler/momentum/floorplans/388m

Questions

What size mattress is in the Grand Design Momentum 388M?

The main bed is 60 × 80 in (Grand Design spec sheet, 2018).