Just to add, i was going through a war scenario of an Indian Defence Analyst known to be highly critical and fair to both Pakistan and Indian armies.
The scenario he painted, just one scenario ofcourse there can be many more.....in his scenario PAF opens up the war by systematically destroying all major bridges in Indian territory within 200 kms of the international border. Now, no one, even both armies combined, have that much engineer bridges to replace all of them.
Result, as per him, move of important and heavy Indian formations got late,Pakistan Army made good of that time to achieve critical gains in several sectors.
Thats why, and how, bridges are important. And hence, weight of vehicles as well.
A worthy and excellent weapon system or platform, if it doesnt reaches the battlefield in time, then no use of it. Thats called superior maneuver....simply isolating a critical asset before it can be used.