would be easy just to buy old travel trailer n gut it or change as desired. however, of course it is possible to cut off the front of the desired bus-trailer and remove the spring hanger rivets n move the rear axle assy up forward to make a properly balanced trailer. of course, tongue n brake system is essential. changing rear suspension types, extending or shortning frames is very common for trucks.
Also would not be difficult to buy two or three mobile home axles with brakes and build your own trailer... trailer supply places even have the normal type of hubs, etc for regular wheels...
Jesus Christ... Conversion in progress.