Thanks for your comments!
Here is an update:
The dealer is replacing the floor for free and are taking it up if Ifor Williams themselves. They have now changed why they are contesting it and are saying it failed due to corrosion which was caused by us not keeping it properly. It is kept outside...
Last week while towing with one 15hh connemara on board our Ifor Williams 505 trailer the aluminium floor gave way. Fortunately he did not go right through and was unhurt. We have taken the trailer back to our main dealer (who fitted the floor 2 years and 8 months ago) and we were told that it...