Having a "new posts since your last visit" button would save loads of time. I am currently opening different sections in new tabs, then looking through each section and opening threads in yet more new tabs!
When you look down the message board index you should see 'breadcrumbs' ( smaller blue text) just underneath the Topics number column which indicate how many new posts since your last visit.
Click on the breadcrumb of the message board that you want to read and each topic with have a similar breadcrumb with new posts for that topic if there are any.
Click the breadcrumb and you will navigate straight to the most recently added since your last visit.
Most of the various bits of text around the Practical Caravan website is clickable although this is not always obvious.
Like some other features of this forum engine, I find I cannot trust the 'new posts' message. It misses many or it says there are new post when I ve already read them.
BUT compared to the previous engine this is generally much better than it used to be.