If you've been shopping for a new or used RV, you've probably noticed model names like 2600RB, 250BHW, or 417KB and wondered - what do those numbers and letters actually mean? You're not alone!

Understanding RV model numbers can be confusing because each manufacturer uses them a bit differently. But with a few tips from the professionals at Voyager RV, you can quickly learn how to decode RV model numbers and make smarter buying decisions.

What Do the Numbers in RV Model Numbers Mean?

In most towable RVs - such as travel trailers and fifth wheels - the model number's digits usually relate to the length of the RV's main interior living area, also called the - box" of the RV.

For example:

• The Grand Design Imagine 2600RB offers just over 26 feet of interior living space.
• When you add the front A-frame hitch and hitch-receiver (roughly 2-3 extra feet), and then the rear exterior ladder (approximately 1ft) the true exterior overall length becomes 29 feet 8 inches.

However, not all RV brands play by the same rules. Some - like certain Forest River models - use shorter numbers that can be 7-8 feet less than the trailer's real overall length. This can lead to confusion when comparing RVs, so it's always smart to check the actual hitch-to-bumper measurement.

Always Ask for the True Overall RV Length

When shopping for a travel trailer or fifth wheel, make sure your dealer provides the true exterior length (from hitch to bumper).

This measurement matters for:

• Towing safety and compatibility

• Storage space at home

• Campground site size limits

A reputable RV dealer will always share these specs openly. If they don't - or if they insist the model number equals the true length - consider it a red flag.

What the Letters in RV Model Numbers Mean

The letters after the numbers usually describe the floorplan layout or special features. Here are some common examples:

• RB = Rear Bath: Imagine 2600RB (features a spacious rear bathroom)

• BH = Bunk House: Jay Flight 250BHW (includes bunk beds, great for families)

• W = West: built in a manufacturer's western plant (i.e. Jayco in Idaho, or Keystone in Oregon)

• KB = King Bed: ie in a luxury fifth wheel like the Solitude 417KB

• FKS = Front Kitchen Slide-out: common in travel trailers. (come with rear bedrooms)

These letters give you quick insight into the floorplan type - perfect when comparing different models online or at an RV show.

Do some RV Brands Use True Overall Lengths

Some newer RV models are coming out with their model numbers matching the true overall length instead of just the box size. (or just throwing a random number out there, for that matter!)

For example, a few of Grand Design's latest 2026 Solitude fifth wheels follow this rule:

• 370DV Solitude = 37'10" total length

• 417KB Solitude = 41'8" total length

Still, not all Solitude models have transitioned. Longtime favorites like the Solitude 310GK remain at 34'11" overall, keeping their 'classic number' for consistency with parts, obtained certifications, and resale values.

Final Takeaway: Know Before You Tow

RV model numbers can tell you a lot - about length, layout, and key features - but they're not always exact. They are a great way to make an 'educated guess' as to what size and layout a certain RV model might be. HOWEVER Always confirm the true specifications before buying, especially if space, towing limits, or campsite fit are important to you.

If your dealer is transparent about actual measurements, you'll have a smoother, smarter, and more confident RV shopping experience.