if you can get to the box where the external cord is attached, my friend's MH had one screw and the lid was off, three obvious lug nuts there, white/black/red. with 30 amp would need just B/W. buy a suitable piece of 8-10 2 wg and jumper from there to the surge protector and plug/wire in cord there. if your input is thru a surface mounted male twist lock plug then it will be more difficult to find the proper place to hook up.
I epoxied a padlock hasp to the side of mine and run a locking cable thru there. I did on my motorhome just leave it in a basement compartment, ran a cord from the surface mounted male to the surge protector and used a standard 30 amp cord from there to the pedestal.
do NOT buy a permanent one unless it has a bypass feature.
bumpy