Yes, I know Wez thinks they are great, and yes, I know you - poor sad individual crawling along the A5 dual carriageway at the front of a mahoosive queue of traffic - believe they are the essence of your hipster, freewheeling, 'I'm a hippy from California not a till jockey from Wickes' existence, but
I will have to tell you something...
...they are sheeite. They are the personification of slow. They are wheezy, knackered, shabby crumbling heaps of cack. They do not have the power to pull the skin off a rice pudding and could not drive through a Rizla paper stretched across the road to Wales even if it was wet. If one change of lights on the bypass is sufficient to get through one camper van and an extremely irate driver in an Alfa then we have done well.
Perhaps you should set off in plenty of time for the bank holiday weekends (like two weeks before) or perhaps you did and it just takes you that effin' long to get anywhere? At least in Shrewsbury you are on the flat. I imagine at Dinas Mawddwy you would be at a pace so slow that an irate Gastropod would overtake you, unload a tyre iron and use it to beat your motorised rabbit hutch into it's constituent rusty bits and sweep it from the road.
Seriously, buy a proper car/motorbike and a tent, save up and book a B&B or better yet stay at effin' home and get paid time and a half by Wickes over the bank holidays and go on holiday in Wales in November when it is cheaper.