I'm interested in purchasing a new TiLite. Don't know much about ordering a chair. The DME guy told me I should go for the TR since I was turning it into insurance. Looking at previous posts with cad drawings and measurements for peoples chairs. Once I get measured are all the different dimensions on the chair decided for you? How much dump should you have in a chair? I noticed on the TR that you have limited adjustability vs the TRA which you have full adjustability. Thought it might be good to have more adjustability with the TRA. Seems to be many options available. Like casters, wheels and different brake options etc. Not sure what is best when you can't try out chairs and see what you are actually getting.