Hi trying to get more ground clearance about 50+mm any advice

If it's got an overlay axle, a straight axle will give you 50 mm.

It has ALKO independent torsion suspension. I suggest you talk to ALKO about this. They might suggest the axles be taken out and reinserted a notch more to raise the ride height. Alternatively a caravan suspension expert might be able to detach the whole unit and add spacers. Replacing tyres with larger ones is problematic so Id stay clear if that idea if suggested. Can I ask the reason for a higher ride height? If your hitch is too high for example there is other remedies Cheer Tony

Be good if you replied mate?