Motor Home with Motor Cycle

Hi. I have recently acquired a Motor Cycle, which I intend to tow behind my Motorhome, on a suitable trailer. Typically, we take our motorhome to Europe, twice per year, one trip of about 12 weeks, and a second trip of about 6 weeks, ie about 126 days in total. I have encountered difficulty in obtaining insurance (both 'normal' comprehensive and breakdown cover) for the mortor cycle. All of the policies I have come across have a limit of 90 days per year in EU. Anyone out there know better?