You want to do your homework as Bob said above....
Not only is the Outlaw 29J garage one foot shorter than the 29H at 8' they dropped the weight capacity in the garage from 1500lbs to 1000lbs.
I purchased a 29H to carry my Spyder a couple years ago. The 2018 29H was the last year that the Spyder would just fit.
I also learned that the 1500lb weight rating in the garage was bogus.... and I think that is why the shortened the garage and lowered the weight rating after the 2018 model.
While the garage could physically hold 1500lbs, it puts the GVWR well over its legal rating. The GVWR rating is a bit of a joke to begin with as it is. With a full load a fuel, propane and water and some gear you are just about at the max GVWR.
My Spyder weighed 1000lbs and once I loaded it in the garage I was 1000lbs overweight.
I installed Sumo Springs and Hellwig Sway Bars and it greatly improved the handling and ride quality both empty and full. However the stock tires were at the max and I was concerned of a blowout given they were overloaded with the Spyder and about at their max with just the weight of the coach.
I was about to install Goodyear Commerical Rated 16" tires that would have given me over an additional 2000lbs of carrying capacity but we traded in the 29H for a Super C.