There is a video on the American Motorhome Club (AMC) Facebook page today about filling the LPG tanks.
It shows the bleed valve that you were talking about hissing when full.
Hi ya, yes it will hiss and smell of gas, that's normal.
Most people don't open that valve but I do.
I think the manual says keep the valve open until liquid comes spurting out, then you know you are full.
You should only fill to 80% and no more for safety purposes.
If you call your insurance company and tell them that you are worried that the screen will be damaged if you drive to Inverness, I'm sure they will do their utmost to get someone to you because if it does crack, they will have a much bigger bill!
We are upgrading to a coach this year. If I can sort the coach out, you could buy our Damon Daybreak.
31ft. 2007 with 2008 front one piece windscreen. 2 x slideouts.
I have spent a lot of money on it recently. e.g. 6 New tyres, 4 Trojan 125 batteries, new 1600w inverter with remote control...