We've looked at toyhaulers at dealers and the slope is much too steep to be safe. You might do better buying a used RV that has been converted to make it accessible. Try looking here -
http://www.rvproperty.com/handicap_rv_sales_1.htm If you want to buy new Winnebago will modify to suit your needs -
http://www.winnebagoind.com/products/commercial/ability/ So will Born Free -
http://dodgenmobiletech.com/mobility-rvs Newmar makes one too -
http://www.newmarcorp.com/news/newmar_desiagns_wheelchair We've been fulltiming for about 19 years , most of the time I've been in a wheelchair. Check our blog for more information about my experiences living , camping and sightseeing as a wheelchair RVer. Good luck with your search!
