Thank you for you interest in this subject. It is a passion of ours to keep OHV use available in as many trails as possible.
We must preface this list by providing the source, these company's support The Conservation Alliance1, who, while doing work to support wildlife locations, has not included Off-Highway Vehicle (OHV) use as a part of the supported activities in those areas2.
This is quite unfortunate for the hundreds of thousands off responsible off-roaders that call this nation home, some of which have disabilities and wouldn't be able to hike in to get to their desired destination.
With that said, there are many off-roaders out there who do not stay on trails and quite frankly act like jack-asses out on the trail, which ruin it for the responsible ones. This is why we, as a company, also support Tread Lightly! , who lead a national initiative to protect and enhance recreation access and opportunities by promoting outdoor ethics to heighten individuals’ sense of good stewardship.
We also support C.O.R.V.A. (California Off-Road Vehicle Association), who have been instrumental in keeping California's BLM lands open to OHV use. We also recently started running their eCommerce department on a volunteer basis.
We are not going to tell you what to do with this information on the list below, it is up to you as a free American.