I have previously owned a PMX rear folder for ~5 years. Mars currently sell what looks like an identical model to the PMX model I owned and PMX now sell under the name of Ezytrail.
I would best describe them as 'adequate'. Where I thought they fell down is with the cheap fittings. The basic structure of the camper was ok, welding looked a bit rough but it held together and I never had any problems the robustness of the basic structure. Same with the canvas, was rather light but never had any problems with water proofing / leaks etc.
Dust sealing was fair. Sealing of the flip over unit was good but sealing to the utility box etc was poor.
Now to the 'fittings'. By fittings I mean the things added to make it all work as a camper without fuss - gas struts to assist the deployment when folding over the rear, shock absorbers, canvas hoops, the annex structure and its erection, couplings to connect gas and water, electrical wiring etc. I would describe all that as cheap and difficult to work with.
The gas struts failed, could not buy struts off the shelf of the exact length used on the camper. Same deal with the shocks, could not buy after market shocks of the length used by the camper.
The hoops which spread the canvas as you flip it over failed due to the design of the things. They would always fail unless you took certain precautions when folding it up.
Coupling for water connections were cheap, chrome plated steal things. Probably just air fittings and not suitable for water. They rusted out, became difficult to connect and leaked. The hose from the water tank to the sink / taps was air hose. The water tank was un-baffled and failed at the seams due to water sloshing around.
Locks on the utility box - cheap bits of crap that would spring open on rough roads.
The annex was a joke. Just too much work to set up unless you're planning on staying several days.
Wiring was very basic, joins just twisted together and covered with electrical tape.
Ownership was not exactly a disaster, it never failed to arrive in one piece and I never got wet but I got sick of spending time wherever I stopped jiggering about with things to get it all working properly.
I suppose I should also add my perception is that the quality of these generic Chinese campers with regards to 'fittings' has lifted in recent years so I can't honestly say avoid them at all cost. For weekends away you may find them to be fine but I'm not so sure about their suitability for long extend periods of travel involving months away.
Inspect them closely and make sure your expectation of things align with what you see.
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