Sorex spikes. Sometimes I had a head come off when pulling it out. No problem just glued it back at home. Once in frozen ground I almost lost a point, I had it dug out and glued it back again at home. It's not liable to break or bend easily those Sorex stakes (bending is impossible)
Y beams are a **** to get out of the ground when the ground is frozen solid. However they do a good job in soft ground. But long pins do the same job as well and are easier to get in or out of frozen ground. Again a vote for Easton and Sorex pins
Any dehydrator suffices you only need to cut some teflon sheets to the size of your trays. With a vertical dehydrator you need also to cut center holes in the sheets and leave some space open between tray border and edge of the sheet to allow airflow in the vertical dehydrator (cheap models are always vertical dehydrators).
I've both type of dehydratords. The vertical one is a Stockli and the horizontal one is an Excalibur. Wehn planning a trip I found out that having a massive drying capacity speeds things really up.