I do not have a Grand Design, but have read nothing but GREAT things on the forum.. Like anything, there is a possibility of getting a lemon, but the poor workmanship is fewer from what I have read..
I was looking at them 3 years ago, decided against for several reasons, but the one big reason was I wanted a rear cap... the GD's do not offer one..
Me-Her-the kids
2020 Ford F350 SD 6.7
2020 Redwood 3991RD Garnet