I went to view this searider at the weekend and found it was not as described on ebay...
"The trailer is included, it is old and rusty but seems sound as do the tyres. I would advise any one towing it away to check the condition of the wheel bearings.(as with any boat trailer, although I know off no problems)The boat actual looks better than these pictures make it look.."
trailer is in fact splendidly illegal - very rusty, didn't seem to fit the boat, and at least 6" lateral play in one wheel rim. Tubes looked ok but clearly aging the most worrying aspect is cracking/splintering fibreglass under the transom with some evidence of a bodged repair - also of note there are several large pebbles inside the hull visible from the drain port, curious.
As has been commented earlier advisable to view before buying on ebay - not this time for me anyway