Gas Bottles for Camper Trailer

Ring the place you bought the camper trailer from and ask them. If they haven't built the gas bottle holders properly take it back to them and make them adjust them.

Steve, it might be stating the obvious but have you tried opening up the adjusting screw as most holders can be slackened or tightened.

if a 4.5 kg bottle is the correct one, do you mean a 3 and 4kg is to small for the holder ????

4.5 kg gas is available in both short squat bottles or a tall thinner bottle & it's the later I'd guess that will fit your holder. If using swap & go bottles where you get different sizes I'd replace the holder with one of the strap types which have more ajustment.
Craig..............

Same trouble for me, Primus bottles (blue in colour) fitted mine - nice and snug, smaller diameter than most others (in the 4.5 kg) A bit expensive to start with but if they fit it's worth it! Just need to get them filled each time, not swapngo.

If you're talking about a thread not being long enough then I would presume that the manufacturer has just installed standard prefabricated gas bottle holders and welded them on to the trailer, ones made in china and purchased pretty cheap. If so I've got the same as so would most other lower-middle range camper trailers. so try a primus bottle and see how you go.