Just pick up the front end and set it in sideways. You might need a buddy to help lift it.

 

My BF 750 is right at as longas my 6 1/2 trailer is wide. I pull my quad sideway on ramp and have the kids help me get it straight and then use my Torman (Pep Boys) Quad jack to side it to the front.
Then the same with the other one and the last is almost there when you are on the ramp.
I am going to buy a folding quad ramp and just go over the side next time with the front quad. I seen a guy on the gallery with an open utility trailer like mine with that over the side rails ramp. I will need to use my Pepboys again plastic auto ramps to land on the other side and leave the quad on them for trasport and ease of unloading.
If I had the dough at the tme I would have bought a side loading Zieman like my bro's but I was lucky to get my 12ft $1300.00 little trailer at AZ-Tex
Good luck and happy loading. Calvin