Most coverage of the CARB motorhome situation treats it like a coming storm. It’s not coming. It landed.

As of the 2026 model year, seven states have effectively halted new motorhome sales for rigs over 8,500 lbs GVWR. California, Oregon, Washington, Massachusetts, New York, New Jersey, and Vermont are all operating under CARB’s Advanced Clean Trucks rule right now, and dealers in those states cannot legally sell new motorhomes built on conventional internal combustion engine chassis. Four more states, Colorado, Maryland, New Mexico, and Rhode Island, join the restriction with the 2027 model year. The reason this matters beyond those eleven states: it’s squeezing national inventory at a moment when the industry was already bleeding. According to RVIA data, May 2026 wholesale shipments hit only 22,900 total units, down 5,250 year-over-year, a 10-year low. The restriction isn’t creating a new crisis. It’s compounding an existing one.

The part that nobody in the trade press says loudly enough: there is no compliant replacement product. Zero certified zero-emission chassis rated for motorhome manufacturing exist as of mid-2026. Manufacturers aren’t holding back a cleaner option. There isn’t one. Dealers in affected states are caught between regulations requiring compliance and a supply chain that can’t deliver it.

Key takeaways
  • Seven states banned new motorhome sales over 8,500 lbs GVWR starting with 2026 models.
  • Four more states join the ban for 2027: Colorado, Maryland, New Mexico, and Rhode Island.
  • No certified zero-emission motorhome chassis exists yet, leaving dealers with no legal replacement to sell.
  • May 2026 wholesale shipments were 22,900 units, a 10-year low, down 5,250 year-over-year.
  • California diesel motorhomes over 14,000 lbs GVWR face a $32.13 annual compliance fee and DMV registration blocks.

What the ACT Rule Actually Does (and Doesn’t Do)

The Advanced Clean Trucks rule doesn’t ban driving a motorhome. It bans selling new ones in affected states when the manufacturer can’t source a compliant chassis. That’s a meaningful distinction for buyers who already own rigs, but it’s cold comfort if you were planning to buy new this year in any of those seven states.

The restriction applies to Class B, C, and A motorhomes over 8,500 lbs GVWR. That’s nearly every Class A and most Class Cs on the market. Class B vans built on lighter chassis may slip under the threshold, but check before you assume. As RV.com noted in their breakdown of the California situation, the practical effect is that dealers in restricted states can’t receive new compliant units from manufacturers, making “new motorhome” a largely theoretical product category in those markets right now.

Used rigs are unaffected. Towables are unaffected. The market hasn’t stopped. It’s been redirected, and not in a direction that benefits people who specifically wanted a new Class A.

California’s Separate Diesel Problem

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If you’re already running a diesel motorhome over 14,000 lbs GVWR in California, there’s a second regulation to track independently of ACT. California’s Clean Truck Check program requires annual emissions testing for rigs in that weight class, with a $32.13 compliance fee in 2026. Skip it, and the DMV can block your registration renewal.

This one catches full-timers off guard because the enforcement mechanism runs through vehicle registration, not roadside inspections. You can drive through California without anyone stopping you. But when renewal comes up, non-compliant rigs get flagged. For people using California as a home base or spending significant time there, this is a real annual line item and a real administrative task, not a hypothetical.

The $32.13 fee is modest. The compliance process itself, finding a certified testing station, scheduling, dealing with any failures, is not always modest.

The State-by-State Timeline, Ranked by Urgency

Here’s where things stand by model year, because the dates matter for purchase timing:

StateACT Restriction Effective
California2026 model year
Oregon2026 model year
Washington2026 model year
Massachusetts2026 model year
New York2026 model year
New Jersey2026 model year
Vermont2026 model year
Colorado2027 model year
Maryland2027 model year
New Mexico2027 model year
Rhode Island2027 model year

If you live in a 2027 state and want a new motorhome, this buying season is the last window under current rules. That’s not a scare tactic. That’s the regulatory calendar. Dealers in Colorado, Maryland, New Mexico, and Rhode Island are sitting on inventory that will be unsellable as new stock next model year if they don’t move it.

What This Means for Buyers Right Now

The market is distorting in predictable ways. Used motorhome prices in affected states are likely to firm up as new inventory disappears. Buyers in non-restricted states are getting a wider selection, at least temporarily, because manufacturers and dealers are routing available stock toward states where they can legally sell it.

If you’re serious about buying new and you’re in one of the eleven affected or soon-to-be-affected states, your realistic options break down like this:

Buy used. The used market is fully functional, and with wholesale shipments already depressed, dealers are motivated to move pre-owned stock. Prices aren’t soft everywhere, but there’s room to negotiate.

Buy in a non-restricted state. This is legally clean as long as you’re not a resident of a restricted state trying to circumvent the rule by registering elsewhere. If you’re a full-timer with domicile flexibility, the state you choose to register in suddenly matters more than it used to.

Wait and watch. The RV Industry Association has been pushing back on CARB, and there’s political pressure on the rule in some states. Waiting is a real strategy, though not a guaranteed one. There’s no timeline on zero-emission chassis certification that suggests relief is imminent.

Downsize to under 8,500 lbs. Class B vans have gotten genuinely capable over the last few years. Not everyone’s answer, but worth running the numbers if your current rig choice was driven more by habit than hard requirements.

The industry was already having a rough 2026 before this hit full force. A 10-year shipment low combined with a multi-state sales blockade, and no compliant product on the horizon, means the pressure on dealers isn’t easing soon. If you’re buying in an affected state, you’re making decisions in a constrained market. Know what you’re working with.

Sources

Photo: Luke Miller via Pexels