hi again a little info panzer 3 stronger springs! so far because i have changed the suspension arms for metal and fitted metal wheels which has removed all the slack i have found no need to put stronger springs along the full length of the tank as for the front and rear springs i dont have because i put in home made shock absorbers which have very small springs inside the all up weight of the tank must be close to 10LBS i have 2 batterys in and it runs very well does not drag its belly.