Shock Replacement - Any Experience with these?

I've used KYBs in the past and they work well, but a Gas-A-Just is a twin tube lower end shock, where a Bilstein is a monotube higher end shock. Bilstein will be the better shock. Whether it rides better or not depends on your opinion and desired outcome.

No experience with motorhomes, but most KYBs I'ves used were a little firm in compression and loose in rebound, making the ride a little more bouncy than the "euro-firm" feel of a Bilstein.