Petroleum prices don’t seem to be cutting into many travelers’ summer plans, and that goes for campers, too. At Winnebago Industries in Forest City, spokeswoman Sheila Davis says pump prices haven’t affected R-V sales.She says business has improved in recent years, with baby-boomers entering the market. The first are in their mid-fifties, the target market for motor homes, so the company plans on thirty more good years. And like other drivers, they’re not letting gas prices dampen their travel plans, says Davis.Davis says typically customers put only about eight thousand miles a year on an R-V so mileage isn’t the big consideration. Plus, when they’ve spent a year planning a vacation, fuel prices aren’t going to make them forget it. She says there are no fuel-economy rules for campers, but says a new front-wheel-drive model built on a VW frame gets fifteen miles a gallon. Davis says travelers using an R-V instead of hotels won’t mind adding fifty or a hundred dollars to their costs for a whole trip.