We had a 22' toy hauler prior to our truck campers. Our model could be configured with up to two lift queen beds and two folding twin beds. Ours only had sleeping for four but had a slide out, picture windows and a booth dinette.
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28310024/gotomsg/28310264.cfm#28310264Measure from the floor of your truck camper to the underside of the cab over. If you have less than 4' you may need to build up the base to clear the taller Ford cabs. GM's have the shortest cab height, so from your pictures it looks like that Lance would need a boost.
