I'm at my wit's end trying to decide between a diesel pusher and gas Class A motorhome for our family of 6. We've been researching for months and keep going in circles!
Here's what's driving me crazy - diesel pushers from around 2010-2012 seem like the budget sweet spot, with their quieter engine placement at the rear and more comfortable ride. But we had a devastating mold problem in our last house that affected everyone's health, and I'm terrified of buying an older RV that might have hidden moisture issues.
The newer gas Class A units (2015 and up) seem like they'd be safer from a mold standpoint, but I worry we're sacrificing ride quality and long-term reliability. Since we don't already own a heavy-duty truck, a motorhome seems more practical than a 5th wheel. With four kids, comfort matters, but their health matters more.
Am I overthinking this, or should the mold risk really be the deciding factor here? I just need someone to tell me straight - which way would you go?
For your family of 6 with mold concerns, I'd recommend a newer gas Class A (2015+) over an older diesel pusher to minimize mold risk while still getting the space you need. The health factor outweighs the noise/comfort advantages of diesel in your situation.
Given your family of 6 and serious mold concerns, I'd strongly recommend going with a newer gasoline Class A (2018 or newer) over an older diesel pusher. Your health considerations outweigh the noise and ride quality benefits of diesel. Newer gas units have better moisture control systems, updated materials less prone to mold, and you'll have warranty protection. For your situation, consider models like the Winnebago Vista or Forest River FR3 - they offer good space for six people and have proven track records for moisture management.
Your dilemma stems from the fundamental trade-offs in the RV market. Diesel pushers from 2010-2015 are more affordable now but represent the age range where moisture intrusion and mold issues become more common causes for concern. These older units often have aging seals, outdated ventilation systems, and materials that weren't designed with modern moisture control in mind.
Gasoline Class A units have evolved significantly in recent years. Manufacturers like Winnebago, Forest River, and Thor have improved their moisture barriers, ventilation systems, and interior materials specifically because of widespread mold issues in earlier generations. The newer gas engines (Ford V10, Chevy 8.1L Vortec) are also more reliable than their predecessors.
Your mold sensitivity makes this decision critical - even a great deal on an older diesel could become a health disaster and financial nightmare if moisture problems develop. The cost difference between gas and diesel maintenance becomes irrelevant if you're dealing with mold remediation.
WARNING: Always use proper safety equipment when inspecting RVs, including non-slip shoes and have someone assist you when climbing on roofs or accessing high areas.
For evaluating potential RV purchases, you'll need a moisture meter (Tramex or General Tools models, $50-150), a good flashlight or headlamp, and a borescope camera ($30-80) to inspect hidden areas. These tools will help you detect existing moisture problems before purchase.
If you decide on the 5th wheel route instead, you'll need to factor in the cost of a heavy-duty truck capable of towing 12,000-15,000 pounds safely. This means a Ford F-250/350, Chevy 2500/3500, or Ram 2500/3500, which will run $40,000-70,000 used depending on age and condition.
For ongoing moisture prevention in whatever RV you choose, invest in a dehumidifier (Eva-Dry or similar, $100-200), moisture absorbers like DampRid, and quality RV covers for long-term storage. A digital hygrometer will help you monitor interior humidity levels.
Start by setting a realistic budget that includes not just the purchase price, but also immediate improvements you'll need to make. For a family of six with mold concerns, budget an extra $3,000-5,000 for upgrades like improved ventilation fans, mattress replacement, and moisture prevention systems.
Focus your search on 2018 or newer gasoline Class A units in the 32-36 foot range. Models to consider include the Winnebago Vista 32HE, Forest River FR3 32DS, or Jayco Precept 35UP. These offer good floor plans for large families and have better build quality than earlier generations.
When inspecting any RV, check all exterior seams, window areas, and roof penetrations with your moisture meter. Calibrate the meter according to manufacturer instructions and take multiple readings at each location, following your meter's specific contact instructions. Pay special attention to slide-out seals and the areas around the bathroom and kitchen. Any readings above 5-8% moisture content (verify acceptable thresholds with manufacturer specifications) should be a red flag.
If you find the right unit with minor moisture issues, negotiate the price down and immediately address problems with proper sealants like Dicor or EternaBond tape. Replace any soft spots in floors or walls before they become major structural issues.
Call in a professional RV inspector before purchasing any used RV, especially if you're spending over $75,000. The $400-600 inspection cost can save you thousands in hidden problems. Look for inspectors certified by NRVIA (National RV Inspectors Association) or other recognized RV inspection certification programs.
If you discover existing mold during your search, don't attempt DIY remediation on a potential purchase - walk away. Mold remediation in RVs often costs $5,000-15,000 and may never fully eliminate the problem due to the construction methods used.
For the 5th wheel option, consult with truck dealers about proper towing capacity and equipment. Many salespeople will underestimate what you need, and inadequate towing capacity is dangerous with a family onboard. A qualified dealer can help spec the right truck, hitch, and brake controller setup.
Finally, consider working with an RV dealer that specializes in family units and has experience with moisture prevention. They can often install upgraded ventilation systems, moisture barriers, and other preventive measures during the purchase process at a lower cost than aftermarket installations.
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