Somebody may have already said it, but, it isn't a mistake unless it didn't serve it's purpose.
In order, we had:
79 Diamond GT an 18 ft pregnant van with a fiberglass body. Great for travel, fishing, weekends and that's what we wanted it for. Actually made money when we sold it.
84 Jamboree 24 ft. Great for short vacations for two. Needed a dinette to make it long term livable. Was great for what we bought it for. Almost broke even on the sale.
91 Jamboree 26 ft. Basically added a dinette to the 24 ft model. Made it much more livable and extended our tolerance to a couple of weeks at a time. But, got too lazy for the overhead bed. Cost us about $1,000 depreciation to own.
96 Southwind 36 ft with 1 slide. We thought we had died and gone to heaven till the first mountain and we almost did die and go to heaven before we got to the bottom. But, in 40,000 miles and 5 years, we were more cautious and loved it and it served its purpose. Cost about 13,000 in depreciation.
98 DSDP 38 ft with 1 slide. Maybe should have extended a little and got the second slide, but it does what we need it to do and after about 6 months and 12,000 miles, we love it too. We'll see how the DS holds it's value in a few years when double slides are less expensive.
So, all in all, through hard shopping, we have only invested about $15,000 depreciation (+ the DS's unknown depreciation) in more than 20 years of motorhoming. No way any of that can be called a mistake (except that mountain in the Southwind) We have loved every minute of it (except that mountain in the Southwind).
Jerry and Katie
More than 20 great years motorhoming and still loving it...
2004 DSDP 3810 (more than I needed...less than I wanted)
2004 Trailblazer (too heavy but well worth dragging)