The HFs work but are cheaper in their wood and casters. I have two HD ones and one HF. I cracked the wood in my HF one when the piano slipped a little in my hand and dropped about 2" onto the soft unpadded wood. Also, the HF one's caster has seemed to have broken and doesn't like to swivel...
Another option is if you rent a Uhaul truck is they have ramps. Buy two of http://www.homedepot.com/p/Milwaukee-1-000-lb-Capacity-Furniture-Dolly-33700/100057209" and then roll it down the ramps. It's how I moved a piano, two huge Vidmar cabinets, and some other heavy tools in my last move...
There are 4 hard blocks(all the photos make them out to be hard rubber), that you place at your jacking locations before lifting. Most of the photos make them out to be roughly 4x4x8. So plenty of surface area too.
Thanks. I have read over your build and really like how it looks. Just worried that doing heavy amount of pure automotive work would be an issue on the titles. Glad to hear it won't be an issues. Seem like more high end look.