I use a Ridgid brand case that I can stand on with confidence.

The Axler Portable Medium Duty Shooting Riser is designed for stand alone ( one at a time) use and is not designed to link with other Axler Riser or create a floor.

The Axler Portable Medium Duty Shooting Riser (4 x 4') is a 4ft x 4ft riser platform that requires as much space for setup. The legs are all equal height, so should it be used in a location where the ground is not level, you may need to put something under the legs to keep the platform steady and secure.

This riser has a 450 pound weight capacity, it will very stable. We are not aware of it making any noises either.

Yes, the Axler Portable Medium Duty Shooting Riser (4 x 4') can be used on grass.

This will all depend on where you are shooting and what this riser is sitting on. However under normal circumstances vibration should not be seen in your shots.

They stated the weight below but here is some insight on having this in person. Its a great/reasonable size for a one person set up. It comes in two cases, one for the legs and the 3 sections for the platform are in another case. The legs are super light and open just by spreading it out. The 3 platform sections weigh in person no more than one would expect. Heavy duty like a good aluminum ladder but not too heavy to where its cumbersome. Its also not too high to get on top of without a stool and your gear. I feel as though the 4x4 would be best if you did not need it for travel as much but more for having it set up in a stationary place such as a church etc. So far I really like the 3x3!