i have a 2 person Naturnest RTT and a banger overland camper top. the demsions for both are listed below in the description.
the camper top with roof rails retails for $3,200 and the RTT $1,500

RTT- 83''L x 51''W x 59'' H
camper shell- 72''L x 67 1/2''W (for 5'8'' bed size)