Had a pair of these Pingel's rip out before and dump my wife's HD, had to break hard and the bottom lock in lug snapped clean off. Yes I use a rear hold back strap! I moved to bike pro brand and have been VERY happy ever since! And yes the base plate is hard bolted in place and the roll in chock is held in place by 2- 3/4" bolts. Takes 3 min to remove one!
[ame=http://www.amazon.com/BikePRO-Black-Removable-Wheel-Chock/dp/B00EPMX5C4#]Amazon.com: BikePRO Black Removable Wheel Chock: Rage Powersports: Automotive[/ame]
Also you have the option of 4 skinny pads you will need to bolt in for our narrow front tires. I have a 24' 4 bike trailer and a two bike trailer in black identical to yours. In the 4 bike I have yes 4 plates hard mounted and two in the other trailer and 4 Bike Pro chicks I can swap out between the two trailers. This chock will also hold the bike up right while you wratchet it down!