I've done this a billion times
it depends on how long to take in the carbs. If you carb load for a few days, your weight will nearly always spike and then drop even if you continue to eat moderate carbs
My preference, and what is advised a lot, is to end the dieting period with a full body workout. Then carb load like crazy for at least a day (low fat mind you).
example of my last carb up:
day 1 (huge carb intake)
weight 197 (+13lb) in evening 24hr after start
day 2 moderate intake (>300g) bw 194
day 3-4 moderate intake moving to maintenance
day 4 morning down to 191 and stay at this weight.
so about a 6-7 pound difference for me carb loaded vs. moderately depleted and dieting
Extended low carb dieting or depletion work while not providing sufficient carbs will eventually lead to decreased glycogen concentrations.
When your glycogen stores are low, there is a nice physiological trick. Carb intake is going to go right to refilling muscle and liver glycogen and also do a ton of good stuff for your hormones and metabolism. I also load l-glycine and creatine during this period.
When you load the carbs, you get about 3g of water for every 1g of carbs. Avg weight trainer might hold 16g carbs/kgbw in glycogen stores. That's like >1300g for me. Way more for huge guys, especially with impressive sarcoplasmic hypertrophy. So it's no surprise that there is a huge weight fluctuation. I think it's basically lean mass. Bloating sucks,but it goes away and doesn't even happen if you carb load right.
You end up looking fuller and bigger and physically more impressive. Plus positive hormonal effects that only carb intake can trigger, ending catabolism, and making you stronger by purely biomechanical means. No reason not to do it imo.