If one can not see the seam, from the ground, use EternaBond. Drop a chalk line where you want the edge of the EternaBond to go. With this product you get one chance to place it. It has a 10 year warranty. Did my roof 6 years ago and there have been no problems.
The need for a toad depends on how often and where you RV. Enterprise car rental company is good, if they are where you RV. For me, I want the toad. I spend 6 months a year in the coach.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours