I just use the 2 by 6s. Home Depot even cut them to size for me at no charge. I think I had less than 6 bucks invested. I just throw them in the back of the pickup. No need to bevel them. If I need more than one on a side I just off set them a bit.
2012 Jay Flight 19RD TT
W/thermal package: R19 walls, R22 roof, R24 floor
2008 F-250 Ford FX4 6.8L V10/4.10 rear axle
Curt class V hitch
Reese trunion WD with dual cam
AC6CV/7 ex-W8RUR since 1954