I think most camper size specs are listed for the main body width, length, height, without consideration for appendages such as jacks, ladders, vents, a/c units, etc.
Most shipping containers are 96" outside width, which means about 92" inside width. Wide body containers are 102" outside, which means about 98" inside width, if my memory serves me right.
You may want to look for a narrow body camper, 84", if you want to ship it on a container ship. Six-Pac and Capri both make/made narrow body hard side campers in the 8'-8.5' floor length models.
01 International 4800 4x4 CrewCab DT466E Allison MD3060
69Bronco 86Samurai 85ATC250R 89CR500
98Ranger 96Tacoma
20'
BigTex flatbed
8' truck camper, 14' Aristocrat TT
73 Kona 17' ski boat & Mercury 1150TB
92F350 CrewCab 4x4 351/C6 285 BFG AT 4.56 &
LockRite rear