Habitation door stiff to open&close

Hi I have a Burford 18 reg. The habitation door has become stiff to open &close.I removed the shock/abs/damper and it seems to close ok.Any ideas.Thank you regards Mark.

Perhaps the shock/abs/damber is exerting pressure and moving the chassis slightly?
I notice that my Pollensa hab door can sometimes become a bit stiffer to open/close depending on whether the van is parked on level ground or a slope for any length of time, presumably due to slight distortion of the chassis/body shell.

Hi Roger thank you for that.I have had the van up on blocks one side to move the water off the roof,for the past 3 months.possibly could be the answer.  Regards Mark.

You may also find that if the habitation side of the van has been in direct sun for some time, then due to the heat, metals used in the manufacture of the door and its frame will have expanded such that the   original door frame gaps have shrunk and thereby cause an interference between the two.

Is the door opening and closing ok, when the damper at the top of the door has been removed ? If so, it may indicate the problem lies with the door damper, which is what happened on ours. I lubricated the damper, and all has been fine since.

Just realised I totally misunderstood the original question!