Easy to use cover to protect from sun and rain

Our plans for a car port have been thwarted due to planning restrictions so we're looking into a cover for our newish to us Lunar 524.  The chap who does our servicing has suggested keeping the van on our drive, subject to the ever changing weather can damage the sealant on the van, direct sun/heat dries it out etc. Has anyone any experience of this?  Would a cover be a worthwhile investment in helping to prolong the life of our van?  We're fairly new to this mode of breakaways, loving it so far, and almost at retirement age so want to make the fun last a long time!  Any advise gratefully received...thanks in advance.  Jules & Phil :-)