Young Age/High Mileage or Old Age/Low Mileage MH???

These aren't Mini Vans.

An arbitrary number like 20k miles has no meaning at all. Most RV engine problems are related to poor care of the cooling system. Buy one with documented maintenance, test all the fluids.

There are fewer of 2010's and newer due to the '08 crash. The Diesel Particulate Filter became required for emissions year 2007 and Diesel Exhaust Fluid for Year 2010. You will find nothing wrong with MH's built since '04/'05, although you may not have LED TV's or lights. The newer used ones, 2010 and newer, will be priced by the dealer as if they were really new. Without the benefit of the warranty period.

I've read that 5-7k per year is average usage. The reality is ISB's I would start to get concerned about 200k, ISC's 400K, ISM and above 600k and the same for equivalent CAT motors.

IMHO

IMO since you are looking at a relatively new rig (2010 or newer), the mileage really doesn't matter. Whether it has 10K or 50k miles as long as it was maintained properly it will be fine. At this age I would be more concerned about wear and tear on the interior components. Just my 0.02 cents.

Lou
05 Travel Supreme Envoy

Bought my Dutch Star new in May 2005, just went over 121,000 this June. Make the annual trek to Spartan for the annual checkout/repair as necessary. Do all my routine maintenance myself, i.e. filters, fluids and the like. Use Lucas fuel additive religiously. No major problems so far. I use it 10 months out of each year, mostly chasing motor racing events.

I LOVE people who work camp. I just do not want to buy one of their low mileage MHs with heavy house usage.

I would prefer some one turning the wheels on a regular basis

IGNORE high miles on a DP - look for medium to higher mileage imo. Ideally people would be putting on 8 to 12 k per year. YMMV

And this is one of the reasons I went with a gas job. I have 20 years working on diesel school busses.

I just turned past 150k on my FT. Run it and do not worry. He coach will fall apart before the engine.

The two motorhomes in my sig were both bought with high mileage. Hubby prefers an engine that hasn't sat around with the rubber rotting. The bus has a Detroit 60, mileage was 220,000 when we purchased it and is significantly higher now. ;) Bought in 2010, we have had no problems. The Winnebago View in my sig is a Sprinter based class C. We purchased it last year with 150,000 miles and after hubby checked it out, we drove it on an Alaskan caravan adding another 10,000+ miles.

So don't be afraid of a few miles, you're not looking at a 1956 Chevy. ;)

I'll say this about diesels since I drove them for a living (I'm now retired) 30,000 miles the motor is just getting broke in! Any of the milage on the coaches that you suggested should get 750,000 to 1,000,000 miles on a diesel engine if properly maintained! I guess what I'm trying to tell you is on the 30,000 mile coach you will wear out the inside of that coach before the motor!

The one that has been taken care of the most

We bought our DP when it was 3 years old with only 8k on it. We had problem after problem after problem. Mostly drivetrain related. Once we retired and started using it we have had not one single problem. It's now coming up on 50k miles. If I ever buy another used one it's going to have been down the road not sitting in the garage!