Thanks for the reply. The timings all come stright out of RV.com and Domestic software's trip planner - so they are taken with quite a pinch of salt. Hmm. Salt - something else to take along with the shovel perhaps :) The vehicle is a great XJS, but no rocket power. I tend to cuise at some speed, but am a very defensive driver (I read many of the tips on your site). Still in two minds on the whole thing, but as you say, it WOULD be fun! Come next Monday I will know. Now, time to check more weather data...