Hey guys, I need some advice from folks with experience! I have a 18ft G3 w/90 yamaha and trolling motor has went bad and need to buy one. The boat is wired for 12v and has 46lb TM that will not pull good if current is strong! I am wondering if 12v 55lb is big enough or do I need to go up to 70lb 24v? The only problem with 24v is the boat has no where to put batteries except in floor up front!