The distance/height from the ground to the mounting plate on the Ultra-Fab Rotating, Hitch Mounted Skid Wheels for RVs # UF48-979014 is 5-3/4". view full answer...
When the Roadmaster spare wheel and tire carrier part # rm-195225 is folded down it will sit 12-1/8 inches above the top of the hitch tube it installs into. You'd need to measure from the top of your hitch tube up to see if it would obstruct your rear door. See picture and attached review video for this for more info. view full answer...
When the center mast on the Curt # C18085 is folded down it measures about 10-1/2". This is from the bottom of the shank that goes into the receiver on your 2016 Ram ProMaster and was taken with the 2" adapter on. So if you have a 2" receiver just measure 10-1/2" from the bottom of your receiver opening but if you have a 1-1/4" receiver you will need to subtract about 3/4" which means you will measure 9-3/4" from the bottom of your receiver. view full answer...