Single drum rollers 2016 1,465 h United States, Snohomish, Washington
Single drum rollers 2013 2,445 h United States, Snohomish, Washington
Single drum rollers 2013 2,475 h United States, Snohomish, Washington
Single drum rollers 2013 1,900 h United States, Snohomish, Washington
Single drum rollers 2015 2,060 h United States, Snohomish, Washington
Single drum rollers 2016 949 h United States, Bremerton, Washington
Other 2017 1,179 h United States, West Richland, Washington