Roads suitable for Caravan

Hello,
FIrst question, so be gentle....

We have a Go5000 which I really really like. We're about to start touring UK with our new caravan and I would prefer to have the sat nav avoid roads deemed unsuitable for caravans.

I've already downloaded and installed "ArchiesPOI" file for UK campsites without any issues which is helpful in guiding us to the individual caravan sites but some roads will be unsuitable.

I've read a little about specific caravan / truck devices but can't justify an addditional £300 when my device is so new (plus lifetime maps and camera features etc).

I think I know that there is a TT camping map available for Europe, from which you can select a country or region.

Is the map suitable for the Go5000?
Is the map available to buy?

Any pointers?

thanks