I put two full size Polaris ATV's in my toyhauler sideways. I bought a hydraulic lift table from harbor freight and put it under the first atv sideways. I used a winch to pull it up the ramp sideways and into the garage. I then dropped the atv down and lifted the second one up and pulled it in. It only took about 5 minutes.
http://www.google.com/shopping/product/10620747048316590991?lsf=seller:8049,store:3210588925490050320&prds=oid:3569269988471718044&q=harbor+freight+hydraulic+table&hl=en&ei=YMAyWpHMN4O6jwSOs6i4AQ&lsft=gclid:Cj0KCQiA38jRBRCQARIsACEqIeuu-jzy-TtiOntDrofRlziBAGDGEpr5qqTCIT-uxq6Ug8ChLvBlPxUaAv0xEALw_wcB