Just sent an article to PBO regarding your, ‘Ask the experts, gel coat crack’. I have a Bav 34 same vintage and have had some experience of using hydraulic sledge trailer. They may publish as I have written for them before but if not I will put it on line for the benefit of other members who may be interested.
If you would like a copy then contact me direct. My email is alanburns1@talktalk.net
