I have never owned a CLASS A. But just from a common sense perspective, I say, stick with your CLASS A. It's not so much you'll have to adjust to a smaller space if you switch to a small trailer. It just makes better sense to use what you already have, what you've already become accustom to, comfortable driving, and don't need to accrue a new expense with a trailer. I think your money would be better spent purchasing a car trailer for your Land Cruiser and towing that behind your "A". Enjoy your "A" .... space, comfort, and familiarity will make a year journey much more enjoyable.
Good luck with your decision. (and imagine this coming from a very happy TT owner!)