well your rr is similar to mine... mines an 89 bob pickup tho...
anyway i got towed across a whole offroad site and shunted up my trailer in P and N on tbox and then shunted around tha farm for 3 months as it was inda way... and it will be a BW box...
if it conked out after a big bump make sure the plugs are still in the alarm... thats what immobilised mine for 3 months...
these are ace offroad...be careful with the electrics though