Lands End to John O Groats

Has anyone had any experience of driving a motorhome from Lands End to John o Groats? My husband is 60yrs next year & is going to cycle the end to end. He's going to do it quite slowly, cycling about 50miles per day. I will meet him in Bessie, our motorhome, to enable us to keep the costs of B&Bs down. It also means that we can be more flexible with timings. We plan to do this in May / June. If anyone has done this themselves, or knows someone who has, I would be interested to know where they stayed along the way. We are new to this, having only had Bessie for a few months. I'm still trying to find out where we can stay overnight for free. We can then use CC sites for special occasions!