Can you put a short bed camper in a long bed pickup?

^ No it won’t be the same, unless the moment arms are the same, ie same distance from rear axle to applied point load and from rear axle to front axle.
Johnny I know you don’t want to believe it, but moment = force x distance in a static equation. I didn’t make the rules of statics and dynamics so don’t shoot the messenger. Lol
If you hung the dirt bikes far enough off the back of the truck, you could pop a wheelie with the truck.